The largest of London's subterranean rivers and once a mad, bad center of London life.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

Pop culture has helped to keep this iconic British building from being destroyed.

One of Europe's largest supercomputers is housed inside of a disused chapel.

This semi-secret storybook hedge maze is also the oldest garden in the city.

One of the only known surviving coconut palm trees in the entire state.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

This massive redwood tree has a hole in the base big enough to drive through.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

On the Oregon coast there is a natural hole that seems to be draining the sea.

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This lovely picnic spot featuring thunderous jet landings is an aircraft spotter’s dream.

This grand gothic brewery has been pumping out suds for over a hundred years.

Disks are rolled out onto the south lawn to absorb the impact of Marine One's wheels like giant coffee coasters.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

A derelict bit of transportation infrastructure hidden in the woods.

This poor little statue is the most vandalized memorial in Washington.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.