Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

Washington's iconic carousel has a nice piece of Civil Rights history.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

The national park was once a plantation estate.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Fittingly, America's museum of architecture is itself a magnificently designed old building.

A computer bug so primitive it was an actual insect.

A Bed-Stuy gymnasium that hosts expansive raves, performances, dance parties, and more.

New York's southernmost subway station is whimsically wavy.

Historic Greenpoint theater, turned roller disco, now housing a chain pharmacy store.

The world’s largest collection of Tiffany glass sits in a warehouse in Queens.

Obscure and obsolete publications are given new life as works of art.

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.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

Holding the most bodies of any cemetery in the United States.

This former crime corner has been turned into an eclectic community center.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

NYC's legendary underground network for bovine transportation.

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

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

The first and only carousel with a lineup entirely of insects.

Spinning silently in the lobby of an Art Deco masterwork is a massive vintage model of the Earth.