Catacombs turned marketplace.

Rebuilt remains of a temple to Roman god Mithras.

The curios of pharmacist and collector Henry Wellcome.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

France's most famous cemetery, with some of its most curious tombs.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

Pop culture has helped to keep this iconic British building from being destroyed.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

An artistic tribute to the famous singer, just around the corner from where he was born.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

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

His "Lionheart" is entombed separately from the rest of his body.

An ancient ossuary in Rouen.