A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This haunting sculpture was created as a statement on the mechanized warfare of the First World War.

This magnificently macabre shield shows the power of chivalrous love in medieval times.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

This hidden green space is the city's second largest conservatory.

A 600-year-old mini shrine guarded by a sword-wielding knight hides in a crumbling cliff face.

Where Agatha Christie mysteriously disappeared in 1926.

Ancient snack bar of the Roman Empire re-opened.

A fake Transylvanian castle houses a cathedral of antlers.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Huge winged monument in the United Kingdom.

Protecting the dead from opportunistic body snatchers.

A sweet symbol marks the place where torturous executions were once carried out.

The final resting place of soldiers' loyal canine companions.