Berkeley Springs State Park boasts the nation's only monument commemorating presidential bathing.

Despite the ever pressing encroachment of urban sprawl this grand New Orleans manse still stands.

This New Orleans tree is filled with hidden chimes that produce a carefully tuned melody.

A former major munitions plant that has been converted into a sprawling art space.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

The narrowest house in America is seven feet of pure spite.

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

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

The first American department store, and home to the largest operating musical instrument in the world.

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

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

A derelict bit of transportation infrastructure hidden in the woods.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Oldest synagogue in the United States.

This lighthouse was witness to the end of WWII hostilities and now collects creepy cairns.

An unexpected Easter egg lurks in the background of a cherub wall relief at the Breakers mansion.

Mysterious stone tower featured in many alternative histories of the New World.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Giant busts of 42 U.S. presidents sit, crumbling in a field in Virginia.