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

Macabre astrological automaton clock dating to the late 1400s.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

A diminutive statue that was inspired by the sculptor's own daughter.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

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

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The underground sanctuary of a mysterious ancient cult.

The middle finger of modernity.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

Study the Alien etchings in this fountain while you refill your water bottle.

A treasure trove of scientific instruments from the 17th and 18th centuries.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

The world's longest and deepest train tunnel.

The bears of Bern have been a city highlight for over 500 years.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Caves famous for the dragon-slaying saint who lived there.

These spooky and unusual stone formations create an underworldly landscape.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

The "Little Ones," show Portugal in full miniature splendor.

One man's remarkable private collection of art from around the world.

An exquisite collection of fairytale conveyances that puts most car museums to shame.