This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Everyone from Mark Twain to Teddy Roosevelt has a pipe hanging from the walls of this historic chophouse.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A historic presidential getaway on the continental United States' southernmost island.

A monument celebrating the idea of reaching inaccessible places.

"We Seceded Where Others Failed."

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Erotic art covers the walls of the largest ancient pleasure palace.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

Legends surround an ancient tree trunk riddled with nails for good luck.

Commemorating the spot where the famous scientist fed his pigeons.

The oldest working mechanical clock in the world.

A fountain standing as a testament to a doomed alliance.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

The first archaeological site discovered by aerial photography.

One of only two remaining Victorian-era greenhouses in New York.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

Cryptic messages embedded in the New York City sidewalk.

This micro-industry of Latino cuisine along Red Hook's Ball Fields represents a victory in a food fight with the city.

Red Hook's massive public pool, built by Robert Moses.

Massive galleon from a box-office bomb docked in Genoa.

Europe’s oldest natural human mummy.