This massive sinkhole measures almost 1000 ft in diameter and is over 400 ft deep.
This massive sinkhole measures almost 1000 ft in diameter and is over 400 ft deep.
Jeb Corliss flies towards the tallest volcanic stack in the world at 1,844 ft.
Photo by Jeb Corliss
During the rainy season this area of large white sand dunes just outside of the Amazon Basin collects large amounts of water creating beautiful lagoons.
Photos by Peter BABILOTTE
Tsingy, a word in the Malagasy language, translates to “where one cannot walk barefoot.”
Photo by Pierre-Yves Babelon
Photo by Pierre-Yves Babelon
Photo by Pierre-Yves Babelon
This 12 foot wide hole in Cypress Creek descends 30 feet straight down before angling into a series of caves and narrow chambers.
Photo by Carl Griffin
Photo by Carl Griffin
Photo by Carl Griffin
The largest chamber is 650ft tall by 490ft wide making it the largest cave in the world.
Photo by Ryan Deboodt
Photo by Ryan Deboodt
The Chocolate Hills consist of over 1,260 grass covered hills that turn a brown, chocolaty color in the dry season.
Photo by Stefan Forster
Photo by Stefan Forster
Photo by Stefan Forster
The Kelimutu volcano contains three separate volcano lakes that vary from blue to green to red.
Photo by Shann Biglione
Photo by Danau Kelimutu
Photo by Danau Kelimutu
It began as a wooden ladder built by the U.S. Military to gain access to a radio antenna. Now the Haiku Stairs are 4,000 steps leading to the Puu Keahiakahoe summit.
Photo by Kristofor Gellert
Photo by Ruidi Wang
Photo by Myk Salonga
The Waitomo cave walls are covered in the glowworm Arachnocampa luminosa, which produce incredible blue, star-like formations.
Photo by Aggelou Zias
Visitors must wear cooling suits to survive the extremely high temperature of 140 °F.
Photo by Nicole Denise
Photo by Nicole Denise
Known as "the road to paradise" this hiking trail in São Miguel Island runs through several volcanic crater-lakes.
Photo by Jorge Feteira
The Tu Sua trench may be the most beautiful swimming hole in the world. A ladder allows visitors to reach the 100 feet of clear seawater at the bottom.
Photo by Lauren Beasley
Photo by Lauren Beasley
On the peak of Ai-Petri two rope bridges stretch to a free standing rock 4000 feet above the sea below.
Photo by Sergey Anashkevitch
Photo by Sergey Anashkevitch
Seventy feet tall hexagonal columns of basalt pillars make up Fingal's cave interior and exterior walls.
Photo by Jim Richardson
Photo by Jim Richardson
You can reach the cave either by boat or you can travel to the small island of Staffa and hike into the cave by stepping from column to column.
Photo by Ron Fullelove
When this canyon was first discovered, herds of prong-horned antelope roamed the area.
Photo by Stephanie Couture
Can't forget about Lake Powell down the street!
Photo by Clinton Melander
This glacially-fed lake in Banff National Park reaches its highest point in late June, during which time the flour-filled water turns turquoise blue.
Photo by Paul Goodwill
Glacier movements 6,200 years ago caused the water level of the Lake to drop, allowing waves to shape these caves into the site we see today.
Photo by Raul Urzua de la Sotta
Photo by Raul Urzua de la Sotta
Photo by Raul Urzua de la Sotta
This treehouse swing in Ecuador allows visitors to thrust themselves over the deep valley below (no seat belts or harnesses available).
Photo by Sean Hacker Teper