This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Banksy's image of a naked man dangling from the window of a sex health clinic.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

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.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A hidden three-foot-wide house separates these two regal churches.

This giant sculpture made of trash is a critique of society's wastefulness.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Giant topiary dog once played a role in a terrorist bomb plot.

This fine arts hall honors the mastermind behind our beloved creepy and kooky Addams Family.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

This replica of the Greek structure is in the heart of Nashville.

At this Nashville restaurant, cheese and charcuterie arrive via conveyor belt.