This isn't your average roadway—it's actually a National Park and a transportation pioneer.

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

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

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

The towering figures were created from the cemetery's fallen old-growth trees.

Once the supplier for noteworthy projects like the National Cathedral, this old brickworks now lies abandoned.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The United States Capitol's former columns still stand.

There must be a pun in this haystack somewhere...

A partially hidden wall graffitied by spectators of the 1976 Bicentennial, recently rediscovered.

A posh members-only club with a literally dramatic history.

Unrepaired walls from a 1920 anarchist bomb attack.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Lie in a hammock where George Washington stood.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.