Flamboyant architecture from the turn of 20th century.

Glowing orb in Minsk houses 8,600,000 items.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

This attraction was abandoned after the Chernobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The largest catacomb system in the world.

A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

Secret Soviet city once home to Russian cosmonauts and space training facilities.

Jumping-off point for a climb up Mt. Everest is the most dangerous airport in the world.

Last stop before the top of the highest peak in the world.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

The most famous location in China was home to whole dynasties worth of imperial rulers.

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Every equinox this Maya pyramid puts on a spooky ancient light show.

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

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

A subterranean house of worship carved right out of the bedrock.

This derelict superstructure was a very important warning system for the Soviet military.