A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

The prototype for all Nazi concentration camps.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

The bomb-ravaged remains of of a colossal Neptune.

A lover's walk between hilltop towns, decorated with graffiti love notes.

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

Geothermal waterfalls in Tuscany.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

100 year tradition of fist fights, marked by marble footsteps.

Go inside to really appreciate this 500-year-old technological masterpiece.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Yugoslavia's biggest underground airport lies in ruins.

Where the lovelorn find a home for their sentimental keepsakes.