This natural wonder drops 16 stories straight down through rare flora and streaming waterfalls.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Climb down into the largest sinkhole in Qatar.

After millennia of erosion by sand and churning water this Brazilian valley now looks like a lunar fantasy.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

Rare recess caves fill this unbelievably beautiful Ohio park.

This extraordinary geological oddity resembles human-made pavement.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

Old vessels have been transformed into artistic canvases in this unusual cemetery.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An experimental forest at the foreground of arboreal science is also the canary in the coal mine for climate change.

These eight mummies are the best-preserved human remains ever discovered in North America.

The world's northernmost flowers cling tenuously to life on desolate Kaffeklubben Island.

Small Island off the coast of Greenland.

The 3.8 billion-year-old rock proves that tectonic plates may have been shifting longer than we thought.

The birthplace of the very first human resident born in Antarctica.

The largest piece of no man's land left on Earth.

These giant volcano sponges in Antarctica are thought to be the world's oldest living animal, at 15,000 years old.

At the point of oceanic inaccessibility, you can't get farther from dry land without leaving the planet.

A wooden hut from the Heroic Age of Antarctic Exploration.

Largest sub-glacial lake ever discovered.