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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

San Francisco's newly reopened hands-on science museum.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A winding path built in secret on the edge of the continent.

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

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

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

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

A band of aerialists and circus performers putting on incredible shows in East Williamsburg.

Lie in a hammock where George Washington stood.

A popular European tradition makes its way to the states on one of America's most famous bridges.

Peek through the gates at this oasis from the city, full of Old English charm.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

More gold than anywhere else, ever.

A semi-scholarly approach to sex.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Elevated freight railway turned wildly successful urban park.