This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

The shell of a medieval fortress offers commanding views of the area it once protected.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

A set of outdoor stairs named in honor of a famous Austrian artist.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Dine amidst exotic plants at this former royal greenhouse.

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

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

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.

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

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

The final resting place for the remains of 143 Habsburg royalty.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Visiting this café is like visiting the Austrian grandma you wish you had.

This cubist Vienna church building looks like some sort of alien stonehenge.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

From atop a hill at the center of Cape Town, a cannon has been signalling the time since 1806.

A 19th-century relic of timekeeping.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.