This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

With over 10,000 lights, this engineering marvel lights up the city after dark.

Underground monastery and fortress.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

The northernmost point of continental Africa—or is it?

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Erotic art covers the walls of the largest ancient pleasure palace.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

Giant novelty guitars now mark the spot where Robert Johnson is said to have sold his soul to the devil.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

Home to items never before seen by the public.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

A fountain standing as a testament to a doomed alliance.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.