The topiary maze at the Habsburg hunting lodge.

Macabre museum devoted to historical Viennese murders.

This former insane asylum now holds a pathological anatomy museum.

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

The world of the ancient Celtic civilization explained through a bewitching 11 acre garden.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

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

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

The world's first and only museum dedicated to dachshunds.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

An abandoned train station in Munich constructed for the 1972 Olympic games.

A modern museum dedicated to the fairytales and dictionary work of the Brothers Grimm.

The birthplace of Karl Marx is now a museum dedicated to the communist revolutionary's life and work.

One of the most easily accessible examples of the rare 1960s UFO houses.

An abandoned underground bathroom is now a space for public art.

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

An abandoned swimming pool decays on the outskirts of Berlin.