It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

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

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

A secret climbing tree hides along the side of a Costa Rican road.

9,000 years of carnal history is on display at China's original Museum of Sex.

Walled family complexes in Southern China.

Inside this museum is an ongoing excavation of an ancient shipwreck.

A small museum dedicated to taking the taboo out of all things related to poo.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

Once an aquarium, this sanctuary now rescues sharks and rays from fishing nets.

A total of 14 men held the title of "president" before George Washington—their historical legacies are enshrined in the lobby of a hotel.

A self-made museum in Queens, New York continues to display the work of a sculptor known for paving his own way.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

This mysterious marker puzzles pedestrians and infuriates geographers.

The preserved house of a jazz legend still echoes with his music.

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

Holding the most bodies of any cemetery in the United States.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

World War II bunker still standing on the New Jersey beach.