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

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The beautiful baroque library of the Hapsburg empire.

Museum devoted to the artificial language of Esperanto.

Handsomely crafted representations of our round planet.

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

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Rediscovered underground chapel is one of the best examples of Gothic architecture in Vienna.

These two 15th-century metal rods allowed people to check if they were swindled or not.

Legends surround an ancient tree trunk riddled with nails for good luck.

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

The largest treasure hoard in Europe is contained in a castle that was bombed out during World War II.

This Dresden church was purposely rebuilt Protestant after being demolished in World War II.

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

Looming communist pillar with a Czech twist.

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

Countless grotesque faces stare out from this eerie Prague art wall.

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

This doorless 20th-century elevator doesn't stop or slow down.

The statue of a cursed knight is said to come to life every 100 years.

The ruins of a medieval bridge are visible inside a Prague Metro station.

A mocking tribute to the past and modern leadership of Prague.

The first museum in the world devoted to sexual gadgetry.

This walkway is so narrow it needs its own light to stop pedestrian traffic jams.