The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The most visited, and possibly most controversial, museum in Germany.

Started as a kitchen garden, now the second largest botanical garden in the world.

This modern arts center is built around a gem of late-Baroque architecture.

A curious cave church carved into the face of a cliff.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

This giant wire frame man sculpture is crouched in contemplation.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A 'living museum' in Leiden, the oldest of its kind in the Netherlands.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Hidden within a Netherlands crater is a stone bed that lets those who lie in it see the sky as a curved surface.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

Peek through a transparent pyramid and drink in the mountain made of books.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A modern sliver of architecture in Roma.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.