The massive gardens and office of a Brazilian sculptor.

This museum was invented in a novel before being made real by the author.

A marvel of Byzantine engineering under the streets of Istanbul.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A pair of connected skyscrapers form this symbolic gateway.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

Memorial to the 89 children killed during the NATO bombing of Serbia.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

A shining memorial to a Belgian hero is said to bring luck to anyone who touches it.

Brussels' favorite peeing boy has a sister.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

This small condiment museum makes all manner of mustards with a 200-year-old mill.

Over time, this castle grew to encompass the entire island.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

This micro-nation may be some sort of prank, but its constitution sure seems official.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.