This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

New York City's first Modernist house.

A reminder to choose water over wine since 1888.

One of the few remaining American elm trees in New York’s Tompkins Square Park was the birthplace of a new religion.

Salute the leader of the proletariat.

New York City's only radical feminist independent bookstore.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Crumbling pink walls and murder memorials preserve the pioneer history of Joshua Tree.

After James Madison's death, his wife and former First Lady Dolley Madison lived in this yellow building near the White House.

This rowhouse doubles as one of the most photographed spots in the nation's capital.

Once home to the largest photo service in the United States.

The only Leonardo Da Vinci painting in the Western Hemisphere.

The grounds of former plantations where abolitionist Harriet Tubman spent her youth enslaved are now a museum to her incredible life.

Inside houses a vast collection of military aircraft and missiles spanning the ages.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

Mass grave of 50 unidentified French Soldiers who died at the Siege of Yorktown, 1781, that gave victory to the American Revolution.

Every autumn, this grove of living fossils erupts in a blaze of brilliant golden-yellow leaves and stinky fruit.

At the western edge of Palm Springs, a rugged desert canyon trail leads to a waterfall at the base of the San Jacinto Mountains.

The ghostly remains of an accidental sea.

An off-grid art installation that encourages its visitors to imagine a world without waste.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.