The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

The centerpiece of the Delta Blues Museum is a wooden sharecropper’s cabin that once housed a titan of blues music.

The first archaeological site discovered by aerial photography.

The playful side of the Columbus community is on full display.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The castle that provided the setting for much of 'Monty Python and the Holy Grail' is now a pilgrimage site for fans.

Legend says a primate-like cryptid prowls this otherworldy sliver of the Louisiana bayou.

Two tombstones associated with the much-beloved children's story.

Frozen in Norway, vended in Singapore.

This 140-year-old beacon off the Florida Keys marks the wreck of a Navy ship that once roamed the Caribbean hunting pirates.

This 1920s Dutch barge is now a floating bookstore.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

A wooden theatre that remains the heart of a charming Victorian-era New Jersey enclave.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A storefront museum in Asbury Park honoring the Jersey Shore’s deep history of mystery—including the Jersey Devil.

The phrase "the shot heard around the world" was coined after a skirmish at this bridge.

Coastal dunes, site of buried Egyptian movie set and former utopian colony.

Lines from a walking song are etched into a rock in Natural Bridge State Park.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

Known locally as "the giant head," this 14-foot LED sculpture has a photo booth in the neck where you can have a 3D picture taken and displayed.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Mysterious installations bring levity and light to a sometimes stodgy city.

This airport currywurst stand is made out of retro airplane parts.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.