A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Hundreds of thousands of ancient documents offer a unique glimpse into Jewish life in Cairo.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Nikola Tesla's former home contains an homage hidden from plain sight.

Two large-scale sculptures of Adam and Eve greet visitors in the nude at the Time Warner Center in NYC.

The mummified relics of an American missionary.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

Walk over a 150 year old manhole.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Tucked in the back of this amazing antique store is an important piece of medical history.

One kilometer of thick brass rod laid out before your eyes.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

The giant scales in this museum can still tell if someone is one of the devil's brides just by weight.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

Cat art as far as the eye can see.

The celebrated eyesore created by starry-eyed sweethearts.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.