A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

Monument to a suicide protesting the Soviet invasion.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

Floating swimming pool within a moored vessel.

An old slaughterhouse now holds the largest collection of pig artifacts.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

Carved fountains poignantly placed in parks and in front of special monuments.

Fantastic views and thousands of love locks.

After years of being casually peed on by humans, this tree is peeing back.

A German apartment building hosting as many trees as human occupants.

A scale rocket of an Ariane 5 rocket serves as a monument to a pioneer of space science.

A strange aquarium with stuffed fish, and almost no water for them to swim in.

An endless sea of white conical domes.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Austria's 5-star prison.

The world's most important buildings shrunk to a tiny size.

Part ski resort, part modern art space, this lodge brings giant metal spiders and bloody doors to the Austrian Alps.

This outsider art house has gone from clinical creation to astounding artwork.

Fantastic stories on a miniature railroad.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

American soldiers discovered Europe's best one-liner at the end of World War II.

The personal charnel house of Anton Bruckner.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.