A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A fake Transylvanian castle houses a cathedral of antlers.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Museum dedicated to the terror regimes of Hungary.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A quaint Russian village in the middle of a German metropolis.

A shrine built to combat the bad karma of a commercial venture.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

A small museum in the Golden Triangle tells the story of the opium drug trade that gripped Northern Thailand.

A white Buddhist temple with a golden restroom.

This elephant kraal is the only one remaining in Thailand, dating back to the 16th century when these massive mammals were integral players in war and trade.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

The golden Buddha statue at the Wat Muang Monastery is the tallest in Thailand, and the ninth-tallest in the world.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

On stormy days debris from this unfinished and abandoned skyscraper rains down on the Bangkok streets.

A treasure trove of pathological, forensic, parasitological, and anatomical specimens.

Bangkok celebrated its shifting monarchy with a militaristic homage to democracy.