The vast, legendary catacombs hold secrets much stranger than stacked bones.

These fantastically named natural pools look like something out of a Scottish myth.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

A miraculous natural phenomenon known as "the spring that breathes."

This Sumatran root bridge took almost 30 years to knit itself together.

This giant statue is the product of a mixture of corruption, Stalinist architecture, and North Korean manpower.

While these wooden totems bear a striking resemblance to First Nations artwork of British Columbia, their actual origins lay on the opposite side of the Pacific Ocean.

A muddy alien landscape that is home to rare species of exotic plants.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

This striking, two-toned confluence of rivers is visible from space.

One man's dream has turned into this naturally growing chapel made of almost nothing but trees.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

This small group of sand dunes manages to pack in a strange rainbow of colors.