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

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

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

A forgotten relic from New York's bygone trolley system hides in plain sight under a bridge.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

Surrounded by low rise buildings and partially converted into an auto body shop, this marble archway is the only vestige of a forgotten Manhattan estate.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

The highest point on the island known for buildings that touch the sky.

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

Hiroshima survivor on Riverside Drive.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

The cave where two British judges hid in exile after sentencing the king to death.

An extra-wide chair built to accommodate the former president's big behind.

Memorial to one of the most fatal fires in both circus and U.S. history.

A tribute to the truly loyal dog who waited outside a hospital for his owner to come back.

An abandoned gun-funded 19th century utopia.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

A mural in rural Georgia welcomes visitors to a fictional Missouri town.

This tiny, painted door at the base of a tree stump has been a fixture of the Harvard University campus for decades.