Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

An elevator into the Baltic Sea.

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

This 8th-century Bavarian monastery is home to an exquisite Baroque-era library.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A madman's personal garden filled with 1,000 sculpted heads.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This constantly evolving art space saved an Italian town from its own crippling reputation.

Cave shrine on Monte Pellegrino.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Italian cave with exceptional acoustics and an unsavory history.

A quiet Sicilian village is home to a cafe that had an important role in "The Godfather."

An eccentric home in Sicily turns heads on a regular basis.

A museum dedicated to one of Portugal's most celebrated writers.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

Plaques on its facade commemorate the Tiber's most destructive deluges.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

This hidden alley near the location of Rome's first theater was the site of a curious miracle.