Collapsing castle on the Hudson river was once the storage site of military surplus business.

Several times a year, during low tide, two pairs of historic train tracks are revealed on this New Jersey beach.

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

The highest peak in the state of Vermont has some interesting features.

A cable-suspension footbridge that hangs high above the Mill River.

This path is named for a mythical half-boar, half-deer creature that once roamed the Green Mountains.

This rare polygonal meeting house is rumored to be built in a circle so that the devil has nowhere to hide.

The world’s largest underground marble quarry is hiding in Vermont.

A gardener's enduring labor of love is spread throughout a small Vermont town.

An ancient glacial pothole waterfall in the heart of the Green Mountains.

These mysterious petroglyphs in Vermont reflect a troubled history in the treatment of Native American culture.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

This tiny cottage surrounded by railroads is the oldest surviving structure in Fairmount Park.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

The first American axe throwing club.

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

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Huge masonic hall in Philadelphia with lavishly themed rooms.

The oldest surviving botanic garden in the United States.

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

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

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

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