Oldest Protestant church in the Middle East, designed to resemble a synagogue.

Museum housed in underground tunnels that date back to Buenos Aires's earliest settlements.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

The Vermont grave of a 4,000-year-old mummy prince.

A warm desert spring holds one of the rarest species on earth.

An old soap company building now houses one of Minneapolis’s oldest independent non-profit art galleries.

Sleepy Minneapolis block beats Guinness Record for most churches on one city block.

A beautiful young girl said to have been buried alive in her coffin…

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A gateway to a mysterious network of underground tunnels.

"The Hoppiest Place in the World" holds the world’s largest collection of bunny memorabilia and is a singular testament of a couple's devotion to all things Leporidae.

A spherical "micro-nation" in the heart of Vienna.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A 140-year-old castle with underground caves hidden in San Francisco.

A one-of-a-kind collection of a unique medium.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

A hospital where antique dolls are given new life.

Unusual outdoor collection of sculptures.

Site of one of World War I's most horrific scenes.

A unique collection of gilded age mechanical pianos.

Gargantuan home of Russian science.

A house carved into a rock in the 1940s.

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.