The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

This memorial includes fragments from one of the greatest tragedies in United States history.

This city park was once a lookout point for George Washington’s army during the Battle of Brooklyn in 1776.

The first piece of public art dedicated to LGBT rights.

The first museum in the United States dedicated entirely to posters.

A remnant from the golden age of aviation still in use today, Pan Am's Clipper service took off from this Art Deco gem.

The world's largest collection of materials relating to lesbian history is housed in a Brooklyn townhouse.

One of only two remaining Victorian-era greenhouses in New York.

Two New York rooftops are home to the largest rooftop soil farms in the world.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A collection of more than 10,000 racist objects that teaches the atrocities of social injustice and intolerance in American history.

Artist James Turrell's ode to dawn and dusk on the campus of Rice University.

This magnificent Japanese garden provides a moment of Zen in rural Vermont.

One of the final grand railway depot hotel complexes is slowly being restored to its former glory.

Sleep where gangsters fell amidst smoke and flame, with nary a bullethole to show for the legendary struggle.

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

Along the old Route 66 is an abandoned trading post made from old telephone poles, built by a former circus clown.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

Don't blink or you'll miss it.

This park is home to well over 100 handmade birdhouses.

In California, colorful roadside signs remind us all that love transcends borders.

In this roadside "community for the small," abandoned toys gain new lives.