This jail which was in service for over a century is now open for curious visitors.

A tradition unlike any other, this marks the site of the annual Groundhog's Day tradition.

A field of nothing but boulders which resembles a giant's gravel driveway.

This stone tower marks a lookout point over the historic Washington Crossing, and maybe some buried treasure.

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

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

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

In which a local geological marvel becomes a quaint roadside attraction.

This might just be the TARDIS of bookstores.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Mysterious rocks that ring musically when struck.

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

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

Local lore claims this park is named after a young woman who jumped off a cliff.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

The site of one of history's most indelible and horrific tragedies.

Remnants of a storybook amusement park hidden behind a strip mall.

This 16-foot, intricately detailed model of the Gearing-class destroyer has been called the most detailed model ship ever built.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

A relic of FDR's brief foray into utopian urban planning.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.