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Natural bridge in Tonto Bridge State Park in Arizona
Sason Valley Mersin Turkey
Tonto National Forest near Payson Arizona
Rock formations inside the Drainage pit ( La Poseta ) on top of Roraima Tepuy, Gran Sabana, Venezuela
Montezuma Well unit of Montezuma Castle National Monument
Travertine rock formations build up over time from the dripping and evaporation of mineral laden water. Eventually the travertine forms into stalactites and shallow caves. Tonto Natural Bridge is believed to be the largest natural travertine bridge in the world. It stands over a 400-foot-long tunnel that is 150 feet wide and 183 feet high. The volume of rock in the bridge is estimated to be 200 million cubic feet. The bridge is the result of water laden with calcium carbonate from perennial springs that have dripped for thousands of years. The natural bridge was discovered by Scotsman David Gowan in 1877. Gowan persuaded his family to emigrate and move to the location where they built a lodge in 1927. They lived there until 1948 when the land and building were sold to Pine native Glen Randall. In 1967 Randall’s widow sold the property and eventually it became a State Park. The lodge is still standing and is now on the National Register of Historic Places. Tonto Natural Bridge State Park is near Pine, Arizona, USA.
Red iron oxide rock formations at Cians gorges, Regional Nature Reserve, Southern France
North Kaibab Trail views of the geology and vegetation of this natural wonder.
Under Todra Gorge, Morocco - between rocks
Red Sandstone Rock Arch Formation - Scenic landscape in desert canyon area with large rock arches against crisp blue sky. Scenic desert landscape with late afternoon warm light.
Verde river valley and distant red rock mountains
Kaklik Cave in Denizli, Turkey
Inside Tonto Natural Bridge in the mountains of Arizona looking at the pond inside of the bridge.
Garden of the Gods, Colorado Springs, Colorado
Arch Cave below Tonto Natural Bridge AZ in Payson, Arizona, United States
Cliff cave dwelling with ladder.
Ancient Pueblo, Bandelier National Monument, New Mexico
Scenic canyon in Deyang, China
Tonto Natural Bridge in winter under blue sky, view from the bottom, Pine, Arizona
These pock-marked formations, usually found along sandstone washes and canyons, have been called “Swiss cheese” and other fanciful names, but are currently referred to by the more prosaic term “solution cavities”.  These examples are found in Capitol Reef National Park, Utah.
Rock formations of the Strait of La Arboleja in Aledo, Region of Murcia, Spain
The cool clear water of Ribbon Falls cascading into its green mossy oasis hidden on the North Kaibab Trail of the Grand Canyon National Park, Arizona, USA.
The Huagapo grotto, Palcamayo district, Tarma, Peru is considered one of the deepest on the planet. It has been visited by speleologists and national and foreign scientists, who confirm its importance and give notice of the many mysteries that need to be discovered. , located at the foot of Cerro Racashmarca
Unique red rock canyon in Jeti-Oguz, South Tien Shan, Issyk-Kul region, Kyrgyzstan
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Red cave in Tenerife Cueva Roja
Various hot springs have formed a unique calcium carbonate and travertine formation (known as Soda Dam) which created a bridge over the Jemez River in Northern New Mexico.\
Hell Sinkhole at Mersin
Tonto Natural Bridge near Payson, Arizona believed to be the largest
Water spring
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