Looming communist pillar with a Czech twist.

This artificial cave looks like something out of a fairytale.

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

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

The first museum in the world devoted to sexual gadgetry.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

Apartment complexes built into huge repurposed natural gas tanks.

Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

A spherical "micro-nation" in the heart of Vienna.

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

The beautiful baroque library of the Hapsburg empire.

Fantastic views and thousands of love locks.

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