The Rock of Gibraltar is a monolithic limestone promontory located in the British territory of Gibraltar, near the southwestern tip of Europe on the Iberian Peninsula, and near the entrance to the Mediterranean.[3] It is 426 m (1,398 ft) high. Most of the Rock's upper area is covered by a nature reserve, which is home to around 300 Barbary macaques.
A unique feature of the Rock is its system of underground passages, known as the Galleries or the Great Siege Tunnels. The first of these was dug towards the end of the Great Siege of Gibraltar, which lasted from 1779 to 1783.
Uluru, also known as Ayers Rock (/ˈɛərz/ AIRS) and officially gazetted as Uluru / Ayers Rock,[1] is a large sandstone formation in the centre of Australia. It is in the southern part of the Northern Territory, 335 km (208 mi) south-west of Alice Springs.
Uluru is one of Australia's most recognisable natural landmarks and has been a popular destination for tourists since the late 1930s. It is also one of the most important indigenous sites in Australia.
Half Dome is a quartz monzonite batholith at the eastern end of Yosemite Valley in Yosemite National Park, California. It is a well-known rock formation in the park, named for its distinct shape. One side is a sheer face while the other three sides are smooth and round, making it appear like a dome cut in half. It stands at nearly 8,800 feet above sea level and is composed of quartz monzonite, an igneous rock that solidified several thousand feet within the Earth. At its core are the remains of a magma chamber that cooled slowly and crystallized beneath the Earth's surface. The solidified magma chamber was then exposed and cut in half by erosion, therefore leading to the geographic name Half Dome.
El Capitan, "the Captain" is a vertical rock formation in Yosemite National Park, on the north side of Yosemite Valley, near its western end. The granite monolith is about 3,000 feet (914 m) from base to summit along its tallest face and is a world-famous location for big wall climbing, including the disciplines of aid climbing, free climbing, and more recently for free solo climbing.
Between the two main faces, the Southwest (on the left when looking directly at the wall) and the Southeast, is a prow. While today there are numerous established big wall climbing routes on both faces (for both free climbing and aid climbing), the most popular and most historically famous route is The Nose, which follows this prow.
Giant Rock is a large freestanding boulder in the Mojave Desert near Landers, California, and the Marine Corps Air Ground Combat Center Twentynine Palms (location 34°19′58.1988″N 116°23′19.5066″W[1]). The boulder covers 5,800 square feet (540 m2) of ground and is seven stories high.[citation needed] Giant Rock is the largest freestanding boulder in North America and is purported to be the largest free standing boulder in the world.[2]
Native Americans of the Joshua Tree area consider it to be sacred[citation needed]. In the 1930s, Frank Critzer moved to Giant Rock. Inspired by desert tortoises that dig holes in which to cool themselves, Critzer dug out a home on the north side of the rock using dynamite.
In the 1950s, Giant Rock was a gathering point for UFO believers. It is located on land which was at that time leased by George Van Tassel, a friend of Critzer's, a purported flying-saucer contactee and organizer of UFO conventions.[5] In 1947, Van Tassel, a former aircraft inspector, leased the property from the Bureau of Land Management and left Los Angeles and moved to Giant Rock with his wife and three children.[3] Van Tassel also built the nearby Integratron and a cafe, store, gas station and the Giant Rock Airport, which he operated from 1947 to 1975.