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

The rusting remains are visible sticking out of the waters of the Delaware Bay.

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

Yo, Adrian!

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

When the Austin Dam failed it destroyed much of Austin...and then it failed again.

An Elvis superfan built Denmark's own version of Graceland.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Preserved "bog person" that is over 2,000 years old.

These three lighthouses played a fundamental role in the maritime life of Eastham.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

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

This strange, big-tailed beast became a Pennsylvania town's unofficial mascot.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

The largest wooden building in the world now houses a fascinating collection of aircraft.

Home of the only civilian casualty at the Battle of Gettysburg.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

Historic town settled in the 19th century because of its convenient location along a popular coal transport route.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

An indoor miniature village and labor of love for Laurence Geiringer, a model railroad enthusiast.

Beautiful views of the surrounding hills and birds of prey can be found at this sanctuary.