Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

A quick and simple solution to Cambodia's train woes.

This unique Renaissance castle was turned into a home for Nazi occultism.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

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

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

Most prolific publishing house in the 1600s open to the public.

Climb inside an iron crystal magnified 165 billion times its normal size.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

To gaze upon the visage of Sri Lanka's biggest Buddha, one must first pass through the Tunnel of Hell.

A church of bones, decorated with 40,000 human skeletons.

Op-art architecture designed for happiness.

The beautiful baroque library of the Hapsburg empire.

The final resting place for the remains of 143 Habsburg royalty.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

A kaleidoscopic warehouse-maze of handmade neon signs.

The cedar tree in Highgate Cemetery earned its title by accident.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.