Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

These Nubian pyramids are strange and unique, even by pyramid standards.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A stealthy Apache hideaway that became the haunting site of a mass grave.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

It's big, it's a ball, and it's made of twine—the world's largest of its kind.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

A six-ton wedding present for the King of the Scots.

The story of Two Guns, Arizona could easily be described as a Shakespearian tragedy on Route 66.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Obelisks and stone pineapples in the Irish countryside.

One of the oldest Jewish cemeteries in the city, it is now overgrown with an urban forest.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.