Centuries-old bridges grown from tangled roots.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

You thought Santa Claus didn't exist, but it turns out you were wrong.

Two New York rooftops are home to the largest rooftop soil farms in the world.

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

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

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

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

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

A giant ball made from pieces of an old Jeep.

This secluded walking trail is a hidden gem of a Pittsburgh park.

The last street in Pittsburgh that's paved with wood.

Hundreds of protractors affixed to surfaces all over the city.

Its vintage camera collection gives a snapshot of the past as viewed through a photographic lens.

This eccentric mansion museum holds a impressive collection of rare and automatic instruments.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

A busy cafe better known for board games than food.

The only Florida state park with publicly accessible caves.