This 15th-century island fortress later served as home to the executioners no one wanted to live near.

Step inside an ancient beehive tomb built for a mysterious cult hero.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

This legendary city has been a tourist attraction for centuries.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

A church of bones, decorated with 40,000 human skeletons.

An enormous and lavish Gothic church in Czechia.

A Baroque mansion with ties to legendary magicians and alchemists.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A historic and beautiful Art Nouveau chamber in a historic railway station.

A plaque marks the spot where the saint was shoved off the Charles Bridge and into the river.

Steadily reminding Czechia of its past.

An eerie, existential museum dedicated to the author of "The Metamorphosis."

This spooky statue sits outside a famous Prague theater.

The first museum in the world devoted to sexual gadgetry.

Macabre astrological automaton clock dating to the late 1400s.

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

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Eat the ultimate iteration of Portugal's most beloved pastry.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

Historic medieval fortified city in southwest France.