The first of Lancaster's "rural cemeteries."

A preserved 18th century homestead in Western Pennsylvania marks the spot where the Whiskey Rebellion began.

A hidden piece of Altoona's railroad history in a long-forgotten abandoned town.

Contrary to what one might expect, ice forms inside this small cavern during the summer and melts during the winter.

It would take 35 firetrucks to fill this enormous glacial pothole.

The ruined remains of a coal mining ghost town are hidden within the woods.

A modern English garden of eccentric beasts, follies, and oddities.

Remnants of a Victorian garden feature sitting in public woodland.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

An eerie, decaying ghost town destined to fade into the forest.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

The severed head of a 17th-century Irish martyr lies within an intricate golden shrine.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

These mystical miniature houses bring a touch of magic to the New Jersey woods.

European castle ruins in an American state park are actually the product of death and grief.

The remains of the furnace and iron works that produced the massive Hudson River Chain still stand in the woods of New York.

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

The walkable ruins of an 19th century hotel, destroyed in a horse cremation gone wrong.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

This pre-Revolutionary War grist mill ground corn and flour for soldiers in seven American wars.

This once-palatial plantation may have been the site where a draft of the Declaration of Independence was written.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

The remains of an old sawmill, gristmill and the surrounding industry dating back to the 18th century.