A psychedelic labyrinth on the San Francisco bay.

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

The world's most famous donkey lives in this pen.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

A building so large that it has its own weather.

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

Avoid gangster interaction while window-shopping.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

A crumbling hospital from the 1850s on Roosevelt Island.

A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

One of only two commuter aerial tramways in the United States.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The prototype for all Nazi concentration camps.

This "floating railway" is one of the world's oldest monorail systems.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

Enormous lake at the bottom of a unique cave system.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

A Borgesian work of art that may blur the line between fiction and reality a little too convincingly.

The only arched bridge made of stone on the entire Mississippi River.