The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Now housed in a museum, this giant pink elephant stood in downtown Seattle for more than 60 years.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

The tech giant built three enormous glass orbs in Seattle so employees could work inside a rainforest greenhouse.

A wall of chewing gum moonlights as collective art.

A uniquely lettered street sign marks the corner where the iconic word game was invented.

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

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

Check out the underground party scene at the "Burning Man of Brooklyn."

Visit the monolithic tomb of America's most famous general.

A bit of retro transportation flair preserved in the world's largest department store.

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

Commemorating the spot where the famous scientist fed his pigeons.

Rummage through this sunken ship, but leave your scuba gear at home.

There must be a pun in this haystack somewhere...

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

Cryptic messages embedded in the New York City sidewalk.

Make a tough dinner decision: Octopus wasabi roulette or bull penis?

Lie in a hammock where George Washington stood.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.