Two volcanic lakes in an enormous crater formed in a prehistoric eruption.

A no-frills cinephile haven known for showing offbeat, underseen films.

A huge collection of rocks, gems, and crystals.

The first bridge observation tower in the U.S. offers one of the best views of Maine.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A fascinating little museum dedicated to the thousands of chemical substances concealed in our food.

According to legend, Bob Dylan sneaks in twice a year to eat dinner with Jack.

A library and museum dedicated to typography.

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

The famed architect designed this Minnesota gas station of the future with a lookout tower.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

A dry lake is what remains of a community founded on a real estate scam.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

An abandoned gun-funded 19th century utopia.

Pensacola's UFO home has withstood many hurricanes—just as the experimental 1960s design intended.

An oversized, oddly designed pedestrian overpass has drawn comparisons to a commode for pachyderms.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.

An abandoned asylum where patients have been forgotten but their possessions remain.

An elevator into the Baltic Sea.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.