This lakefront cottage was crafted in the 1800s and was once a sanitorium.

Legend says Dungeons and Dragons players can get their dice blessed at the creator of the game's memorial.

A place to eat for on-the-run agents and espionage enthusiasts.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

A tragic mystery left this boy nameless for 65 years.

The Ryerss mansion in Burholme Park now houses a community library and a museum filled with a trove of oddities from around the world.

One of Philadelphia's largest murals resides hidden under this bridge.

This museum boasts a bucket of teeth and tells the tale of a 20th-century dental circus.

Dr Barnes' $25 billion private collection of art and arboretum.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

World's first "penitentiary," meant to be humane, drove men insane.

A rare view of a preserved Victorian science museum.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Where America's first doomsday cult awaited the end of the world.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A layered tribute to the work of mosaicist Isaiah Zagar.

Golden and naked, the figure that was once the highest point in New York is all that remains of the second Madison Square Garden.

Have a steam and some blini at this cafe in a century-old bathhouse.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

More than 250 sakes are available in an izakaya hidden in the basement of a Midtown office building.