This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A man throwing a giant severed hand towers over Antwerp’s main square.

The legendary giant's severed hand sits on Antwerp's popular shopping street.

Hiding the longest subterranean river known in the world.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

This outsider art house has gone from clinical creation to astounding artwork.

Micro-nation based around a nine-story high illegally built tower.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A spherical "micro-nation" in the heart of Vienna.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

A tongue-in-cheek arcade where the games are based on everyday life.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

A musical composition 1000 years in length plays at the Trinity Buoy Wharf in London.

Grotto replete with mystical designs laid out in glued shell mosaics.

An intricately decorated tiny place of worship.

Derelict chemical plant on the North Sea is a beautiful industrial ruin.

This tiny train shuttles passengers to one of Northern Ireland's most spectacular sights.

A brisk climb up this solitary peak leads to the origin story of a towering figure in Irish history.