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

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

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

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

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

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

This legendary city has been a tourist attraction for centuries.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

Two stone columns flank the grand Venice square, but there were supposed to be three.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The home of a neoclassical master is now a shrine to his chosen art style.

A modest museum in the final home of Italian poet and father of modern Italian, Francesco Petrarca.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

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

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

The only museum with its curator—and her pets—buried inside.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.