An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

Elaborate tile work in this railway station tells the story of Portugal.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Balconies that have a most unusual accent.

An ancient ossuary in Rouen.

This ancient theater was once the home of fierce gladiatorial battles.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

A national collection of Communist-era musical posters.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

It's good luck to be mocked by this monkey.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This snug medieval lane is one of the narrowest streets in the world.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."