A 132-year-old telescope continues to keep watch over the night skies above Providence.

This large stone residence served as a field hospital during the Battle of Gettysburg between stints as a tavern.

Famed activist Hellen Keller was involved in the operation and administration of this vacation home for blind women starting in the early 20th century.

Grand architectural relics gain a new life in this Pennsylvania warehouse.

This small museum is home to cannons cast by Paul Revere and the last remaining uniform of Egyptian President Anwar Sadat.

An outlet for connecting to memories of lost loved ones and saying goodbyes you never got to say.

This haunting monument honors the victims of 9/11.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

What if the cure for all that ails you was as simple as repeated exposure to low-dose radon?

Experience life in one of America’s smallest neighborhoods.

This original Mason-Dixon line cairn placed in the 1760s was put in the wrong location because of the gravitational pull of the Allegheny Mountains.

One of three remaining theatres in the United States created in the Art Deco Mayan Revival style.

An abandoned early 20th-century gold mine in a spectacular setting overlooking Bridgeport Valley and the Sierra Nevada.

A 1,000-foot-long railroad tunnel under Shavers Fork connected the towns during West Virginia's logging boom until its closure in 1985.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Sand dunes from a glacial lake are preserved in this woodland park.

The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

One man's vision and a labor of love of many.

Tucked away in the forests of Indiana resides an abandoned waterslide that is now a popular graffiti haunt.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A hidden network of subterranean passageways lies tangled beneath Indianapolis' bustling City Market.

The longest navigable underground river in the United States is home to countless blind and albino animals.