A health museum containing a 27’’½-foot intestine.

This eclectic, mosaic-clad home includes a bamboo ping-pong loft and a "Whispermaphones" intercom.

A popular swimming hole that hides one of America's most deadly diving spots.

One of the oldest living oak trees in the Southeast.

When oil was discovered just outside of Pittsburgh, the city became home to this regional stock market.

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

The oldest surviving presidential residence in the United States.

The site of the little-known Pennsylvania battle that sparked the Seven Years' War.

A museum of anything and everything Stooge.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

A staggering collection of photographs depicting medical, social, and historical change.

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

Relics given to a Manhattan church to avoid seizure by the Italian government.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

The oldest living tree in Manhattan comes shrouded in sinister legend.

Once America's longest-manned military fort, now an abandoned hulk.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Lie in a hammock where George Washington stood.

The oldest bibliophilia club in America, with exhibitions on historic books and graphic arts.

This abandoned subway station can still be seen on regular commuter trips.

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

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

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.