In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A fake medieval village in the middle of Turin.

The astonishing collection of an infamous criminologist.

A sandstone block marks the alleged spot where the legendary writer was conceived.

One man's stunning attempt at eco-friendly living.

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

The world's largest collection of intentionally useless inventions.

Designed as a reminder of one of the darkest moments in Austrian history.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

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

The beautiful baroque library of the Hapsburg empire.

An awe-inspiring giant blue whale jaw bone stands in the center of this Dutch island.

The history of sea-faring refuse and disaster is on cramped display in this Netherlands folk museum.

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

Visitors can explore the role of mysticism throughout the ages inside this interactive museum of magic.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

A restaurant and observation deck built in a unique broadcasting antenna.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A surreal museum of extraordinary industrial objects.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.