An overlooked memorial honoring the local Washington residents who died in World War I.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A nostalgic bibliographic gem.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

In the fictional world of Kcymaerxthaere, celestial wonders marked a portal to a powerful route of travel at this site in Madrid, Spain.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Mexican food and folk art.

A multimedia experience that chronicles the atrocities of racism.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

Towering basalt columns, a creation of fire and ice.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

D.C.'s first central library was born out of a chance encounter with the philanthropist whose name it bears.

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

The "lovely red Vega" of the legendary record-settling pilot.