According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Stalactites and stalagmites in a beautifully lit cave.

Pompeii's less famous neighbor is still revealing her secrets.

Renaissance villa and gardens complete with a tormented colossus.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

Architectureal fantasy quarter of Rome.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

An existential riddle in the world's largest ancient castle.

This spooky statue sits outside a famous Prague theater.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

This 600-year-old home seems to defy physics.

This subterranean studio is filled with fascinating kinetic art.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Artist Diego Morlin's war between the natural and human worlds is a wanderer's delight.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

Europe’s oldest natural human mummy.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.