Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

A derelict bit of transportation infrastructure hidden in the woods.

Try not to get slimed in Tribeca.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

Shop selling 500 flavors of soda has something for everyone.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The world's largest museum devoted solely to the whirlybird comes complete with its own chopper graveyard.

This former football stadium seems almost abandoned but is still in use by the next generation of Scottish sports stars.

Where the sleeping monsters of Scotland's oil industry are left to rust.

A Neolithic burial site built 1,000 years before Stonehenge.

This skewed English house has looked like it's going to fall over for centuries.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

Remnants of a Victorian garden feature sitting in public woodland.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

Public access to clean drinking water was an instant hit among the masses.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.