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

Hidden in the rain-forests of Arunachal Pradesh in Northeast India lies the village of Ziro, home to the Apatanis.

The world's tallest slum.

This "floating island" plateau sits 7,671 feet above the forest floor.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

A moving memorial to the fallen and missing from WWI trenches.

Christ's blood preserved in a Belgian town.

A former ironworks that was the first UNESCO industrial site.

Site of one of World War I's most horrific scenes.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

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

A winding, blood-red tunnel of hardened lava navigable by foot.

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

An encyclopedic collection of mammal penises.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Medicinal spa created with the discharge from a geothermal energy plant.

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 symbol of the Workers' Party of North Korea.

North Korea's massive "hotel of doom."

A vast museum devoted to North Korea's victories against its imperialist enemies.

A giant bronze monument to Kim Il-sung and Kim Jong-il is one of the most sacred sites in North Korea.

A former palace transformed into a mausoleum for North Korea's supreme leaders.

A highly symbolic tower in honor of Supreme Leader Kim Il-sung's personal philosophy.

One of the largest public squares in the world, named after the former DPRK supreme leader.