One tiny triangular park commemorates the victims of a yellow fever epidemic—many of whom are buried right below the grass.

A former connection to City Island, it has been abandoned since the 1930s.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

The only known Futuro house in North Carolina sits along a stretch of desolate highway on the Outer Banks.  .

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

The mysterious large white cross visible from the runway is a memorial to a massacre during Spanish Civil War.

Death rituals and sacrifice inside a Peruvian megalith.

The oldest garden in Prague, once part of an medieval orchard.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This abandoned lighthouse looks like a rusting oil rig, but has managed to survive a number of storms.

Set sail on a small scale.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

Lie in a hammock where George Washington stood.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

An unrecognized micronation declared by Greenpeace to protect the glaciers of Chile.

The North Carolina grounds are leased in perpetuity to the British Commonwealth for as long as the WWII sailors are buried there.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

This New England covered bridge is home to the tale of a jilted lover known to haunt the area.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."