Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

This pink watchtower served as the seat of the Greek government after independence from the Turks.

Only open for two days a year, this church links ancient Greek and modern Christian celebrations.

Hidden in the garden of physicist Erwin Schrödinger's house is a life-size figure of a cat from his famous thought experiment.

Europe's largest dinosaur museum was founded by a passionate autodidact.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

This 11th-century Greek monastery has renowned mosaics and relics of a brutal past.

The partially submerged ruins of a white marble quarry used in ancient Greece for over 1,200 years.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

This "volcanic all-day restaurant" is right on the beach.

These ruins of a sacred Ancient Greek temple stand next to a luxurious modern resort.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A medieval military street hidden beneath a charming French fishing village.

An aluminum skeleton brings Chinese mythology to the French shore.

Ivy-covered Medieval tunnels cut through this charming town in France's Loire Valley.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

Beggars were miraculously "cured" of their fake ailments when they returned home to this 17th century Paris slum each night.

Abbey built on the ruins of Roman catacombs.

The largest underground lake in Europe.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

A tower-like theater in the Swiss Alps built to withstand the high winds and avalanches of the mountain pass.