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.
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.
Tsingy, a word in the Malagasy language, translates to “where one cannot walk barefoot.”
This 12 foot wide hole in Cypress Creek descends 30 feet straight down before angling into a series of caves and narrow chambers.
The largest chamber is 650ft tall by 490ft wide making it the largest cave in the world.
The Chocolate Hills consist of over 1,260 grass covered hills that turn a brown, chocolaty color in the dry season.
The Kelimutu volcano contains three separate volcano lakes that vary from blue to green to red.
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.
The Waitomo cave walls are covered in the glowworm Arachnocampa luminosa, which produce incredible blue, star-like formations.
Visitors must wear cooling suits to survive the extremely high temperature of 140 °F.
Known as "the road to paradise" this hiking trail in São Miguel Island runs through several volcanic crater-lakes.
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.
On the peak of Ai-Petri two rope bridges stretch to a free standing rock 4000 feet above the sea below.
Seventy feet tall hexagonal columns of basalt pillars make up Fingal's cave interior and exterior walls.
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.
When this canyon was first discovered, herds of prong-horned antelope roamed the area.
Can't forget about Lake Powell down the street!
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.
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.
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