Test your business savvy and play the market for cocktails at this stock exchange-inspired watering hole.

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

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

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

A trove of century-old litho stones from the Puck Building's printing days were discovered behind a cellar wall, and are now hanging in the store.

A very classy 1920s-era bar right in Grand Central Station.

Down a stairway in the East Village, you could once read a plaque describing an alternate history of a fictional version of Manhattan.

A dilapidated dock tells the story of Titanic's missed arrival.

A reminder to choose water over wine since 1888.

Tucked in the back of this amazing antique store is an important piece of medical history.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

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

A promising candidate for the lost rock laid by George Washington was unearthed, but the hunt is still on.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

The romance of early commercial flight still fills this Art Deco destination.

The remains of a historic plantation nestled in between a parking lot and the rental car return at Reagan National Airport.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

A hands-on traveling collection of the innovative devices of yesteryear.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.