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Fingal's Cave Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, known for its natural acoustics. The National Trust for Scotland owns the cave as part of a national nature reserve. It became known as Fingal's Cave after the eponymous hero of an epic poem by 18th-century Scots poet-historian James Macpherson. Fingal's Cave is formed entirely from hexagonally jointed basalt columns within a Paleocene lava flow, similar in structure to the Giant's Causeway in Northern Ireland and those of nearby Ulva. In all these cases, cooling on the upper and lower surfaces of the solidified lava resulted in contraction and fracturing, starting in a blocky tetragonal pattern and transitioning to a regular hexagonal fracture pattern with fractures perpendicular to the cooling surfaces. As cooling continued these cracks gradually extended toward the centre of the flow, forming the long hexagonal columns we see in the wave-eroded cross-...

Grand Prismatic Spring The Grand Prismatic Spring in Yellowstone National Park is the largest hot spring in the United States, and the third largest in the world, after Frying Pan Lake in New Zealand and Boiling Lake in Dominica. It is located in the Midway Geyser Basin. Grand Prismatic Spring was noted by geologists working in the Hayden Geological Survey of 1871, and named by them for its striking coloration. Its colors match most of those seen in the rainbow dispersion of white light by an optical prism: red, orange, yellow, green, and blue.  

Blue Hole  A blue hole is a large marine cavern or sinkhole, which is open to the surface and has developed in a bank or island composed of a carbonate bedrock (limestone or coral reef). Their existence was discovered in the late 20th century by fishermen and recreational divers. Blue holes typically contain tidally influenced water of fresh, marine, or mixed chemistry. They extend below sea level for most of their depth and may provide access to submerged cave passages. Well-known examples are the Dragon Hole (in the South China Sea) and, in the Caribbean, the Great Blue Hole and Dean's Blue Hole. Blue holes are distinguished from cenotes in that the latter are inland voids usually containing fresh groundwater rather than seawater.

 General Sherman (tree) General Sherman is a giant sequoia (Sequoiadendron giganteum) tree located in the Giant Forest of Sequoia National Park in Tulare County, in the U.S. state of California. By volume, it is the largest known living single-stem tree on Earth. It is estimated to be around 2,200 to 2,700 years old. While the General Sherman is the largest currently living tree, it is not the largest historically recorded tree. The Lindsey Creek tree, with more than 90,000 cubic feet (2,500 cubic meters) almost twice the volume of General Sherman, was reported felled by a storm in 1905. Another larger coast redwood, the Crannell Creek Giant, a coast redwood (Sequoia sempervirens) cut down in the mid-1940s near Trinidad, California, is estimated to have been 15–25% larger than the General Sherman tree by volume.

Musa Ingens The plant species Musa ingens is the physically largest member of the family Musaceae and the only member of the section Ingentimusa. Growing in the tropical montane forests of New Guinea - Arfak Mountains Regency - Indonesia, its leaves can reach a length of 5 meters (16 feet) and a width of 1 m (39 inches). The "trunk" (actually the tightly rolled petioles (or stalks) of its leaves; the longest petioles of any known plant) is typically up to 15 meters (49 feet) in height, and with the leaves having a total height of 20 meters (66 feet). However, since its discovery in 1954 taller individuals up to thirty meters (98 feet) have been reported, but these measurements have yet to be confirmed by a specific scientific study. Photos exist of M. ingens "trunks" up to 94 centimetres (37 in) in diameter at breast height. Its fruit, in a cluster weighing up to 60 kg (132 lbs). This cluster is borne on a peduncle up to 10 cm (4 in) thick and up to 15 m (49 ft) in ...

 The Dark Hedges The Dark Hedges is an avenue of beech trees along Bregagh Road between Armoy and Stranocum in County Antrim, Northern Ireland. The trees form an atmospheric tunnel that has been used as a location in HBO's popular television series Game of Thrones, which has resulted in the avenue becoming a popular tourist attraction.

Sinkhole A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as vrtače and shakeholes, and to openings where surface water enters into underground passages known as ponor, swallow hole or swallet. A cenote is a type of sinkhole that exposes groundwater underneath. A sink or stream sink are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock.  Most sinkholes are caused by karst processes – the chemical dissolution of carbonate rocks, collapse or suffosion processes. Sinkholes are usually circular and vary in size from tens to hundreds of meters (or yards) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide.

Moving Rocks Sailing stones (also called sliding rocks, walking rocks, rolling stones, and moving rocks) are part of the geological phenomenon in which rocks move and inscribe long tracks along a smooth valley floor without animal intervention. The movement of the rocks occurs when large sheets of ice a few millimeters thick and floating in an ephemeral winter pond break up on sunny days. Frozen during cold winter nights, these thin, floating ice panels are driven by wind and shove rocks at speeds up to 5 meters per minute. Trails of sliding rocks have been observed and studied in various locations, including Little Bonnie Claire Playa, in Nevada, and most famously at Racetrack Playa, Death Valley National Park, California, where the number and length of tracks are notable.

Dead Sea The Dead Sea is a salt lake bordered by Jordan to the east and Israel and the West Bank to the west. It lies in the Jordan Rift Valley, and its main tributary is the Jordan River.

Bermuda Triangle  The Bermuda Triangle, also known as the Devil's Triangle, is a loosely defined region in the western part of the North Atlantic Ocean where a number of aircraft and ships are said to have disappeared under mysterious circumstances. The idea of the area as uniquely prone to disappearances arose in the mid-20th century, but most reputable sources dismiss the idea that there is any mystery.

Blood Falls Blood Falls is an outflow of an iron oxide-tainted plume of saltwater, flowing from the tongue of Taylor Glacier onto the ice-covered surface of West Lake Bonney in the Taylor Valley of the McMurdo Dry Valleys in Victoria Land, East Antarctica.  

Lake Hillier  Lake Hillier is a saline lake on the edge of Middle Island, the largest of the islands and islets that make up the Recherche Archipelago in the Goldfields-Esperance region, off the south coast of Western Australia. It is particularly notable for its pink colour. A long and thin shore divides the Southern Ocean (by some definitions, the Indian Ocean) from the lake.

Lake Natron  Lake Natron is a salt or alkaline lake located in north Ngorongoro District of Arusha Region in Tanzania. It is in the Gregory Rift, which is the eastern branch of the East African Rift. The lake is within the Lake Natron Basin, a Ramsar Site wetland of international significance.

Snake Island Ilha da Queimada Grande, also known as Snake Island, is an island off the coast of Brazil in the Atlantic Ocean. It is administered as part of the municipality of Itanhaém in the State of São Paulo. The island is small in size, only 43 hectares (106 acres), and has a temperate climate. The island's terrain varies considerably, ranging from bare rock to rainforest.

The Island of the Dolls The Island of the Dolls (La Isla de las Muñecas), located in the channels of Xochimilco, south of the center of Mexico City, very close to the Estadio Azteca football stadium, is a chinampa of the Laguna de Teshuilo and one of the main attractions of the channels. Dolls of various styles and colors are found throughout the island, originally placed by the former owner of the island, Julián Santana Barrera. He believed that dolls helped to chase away the spirit of a girl who drowned years ago. He died in 2001 of a heart attack. Sources say he was close to the same spot where the girl drowned.  

Easter Island Easter Island (Rapa Nui: Rapa Nui; Spanish: Isla de Pascua) is an island and special territory of Chile in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle in Oceania. The island is most famous for its nearly 1,000 extant monumental statues, called moai, which were created by the early Rapa Nui people. In 1995, UNESCO named Easter Island a World Heritage Site, with much of the island protected within Rapa Nui National Park. Experts disagree on when the island's Polynesian inhabitants first reached the island. While many in the research community cited evidence that they arrived around the year 800, convincing data presented in a 2007 study suggests the their arrival to have been closer to 1200. The inhabitants created a thriving and industrious culture, as evidenced by the island's numerous enormous stone moai and other artifacts. However, land clearing for cultivation and the introduction of the Polynesian rat led to gradu...

VULCAN ISLAND Vulcano or Vulcan is a small volcanic island belonging to Italy in the Tyrrhenian Sea, about 25 km (16 mi) north of Sicily and located at the southernmost end of the seven Aeolian Islands. The island is 21 km2 (8 sq mi) in area, rises to 501 m (1,644 ft) above sea level, and it contains several volcanic calderas, including one of the four active volcanoes in Italy that are not submarine. The word "volcano", and its equivalent in several European languages, derives from the name of this island, which derives from the Roman belief that the tiny island was the chimney of Vulcan, the Roman god of fire. In November 2021, 150 people were evacuated from the island's harbour area due to increased volcanic activity and gases; an amber alert had been issued in October 2021 after several significant changes in the volcano's parameters.  

Palmyra Atoll Palmyra Atoll also referred to as Palmyra Island, is one of the Northern Line Islands (southeast of Kingman Reef and north of Kiribati). It is located almost due south of the Hawaiian Islands, roughly one-third of the way between Hawaii and American Samoa. North America is about 3,300 miles (5,300 kilometers) northeast and New Zealand the same distance southwest, placing the atoll at the approximate center of the Pacific Ocean. The land area is 4.6 sq mi (12 km2), with about 9 miles (14 km) of sea-facing coastline and reef. There is one boat anchorage known as West Lagoon, accessible from the sea by a narrow artificial channel. It is the second-to-northernmost of the Line Islands, and one of three American islands in the archipelago, along with Jarvis Island and Kingman Reef. Palmyra Atoll is part of the Pacific Remote Islands Marine National Monument, the world's largest marine protected area. The atoll is composed of submerged sand flats along with dry land and reef...

ISLAND OF SOCOTRA Socotra or Soqotra, between the Guardafui Channel and the Arabian Sea, is the largest of the four islands in the Socotra archipelago. The territory is near major shipping routes and is officially part of Yemen, and had long been a subdivision of Aden Governorate. In 2004, it became attached to the Hadhramaut Governorate, which is much closer to the island than Aden (although the nearest governorate was the Al Mahrah Governorate). In 2013, the archipelago became its own governorate: Socotra Governorate. The island of Socotra constitutes around 95% of the landmass of the Socotra archipelago. It lies 380 kilometres (240 mi) south of the Arabian Peninsula. While politically a part of Yemen, which is located on the Arabian Peninsula and thus part of Western Asia, Socotra and the rest of its archipelago is a continental fragment that is geographically part of Africa. The island is isolated and home to a high number of endemic species. Up to a third of its plant life is ende...

Naica Mine The Naica Mine of the Mexican state of Chihuahua, is a lead, zinc and silver mine. Located in Naica in the municipality of Saucillo, the Naica Mine is owned by Industrias Peñoles, the world's largest silver producer. Caverns discovered during mining operations contain gigantic crystals of CaSO 4 · 2 H 2O (calcium sulfate dihydrate, gypsum, also sometimes called selenite. Peñoles announced in October 2015 that it was indefinitely suspending operations due to uncontrollable flooding at the Naica Mine. The peak underground air temperature was 58° C (136° F) with 100% relative humidity, which rapidly exposed the visitors to hyperthermia hazard and caused breathing difficulties. Because of the heat, unprotected researchers could only stay up to 10 minutes inside the cave. Longer visits required the use of a special suit fitted with a cooling system (ice reserve in a backpack with cooled water recirculating in polymer tubes installed over all the body surface) and delivering f...