An ancient fortified mound raised over the millennia from settlements built one on top of the other.

The history of Mar Behnam Monastery is that of violence, intolerance, resiliency, and spirituality.

An ancient sanctuary that has long been a holy site for the Chaldean Christian Church.

The sacred shrine of the Yazidis.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

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

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

This historic abandoned train station looks like a stop for ghost trains.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The ritual has been performed uninterrupted for nearly 700 years.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Two gilded cherubs perched on a church bell tower have been reminding visitors of the finitude of life since 1760.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

An ancient water supply dating back almost 500 years can still be found standing in East Sussex.

Also known as Rye Castle, this 13th-century fortification later became a prison and held one of Rye's most famous criminals.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

All that remains of the medieval palace of the famous "Black Prince."

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

A preserved block of timber buildings from the city's industrial era in the Middle Ages.

The bombed out remains of the old church were kept intact next to the new one, as a reminder of the futility of war.

Before online banking and smartphone apps, there was "commuter banking" in the subway in Downtown Brooklyn.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

The star-studded street honors the city's most notable Brummies.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.