Hundreds of numbered stakes hidden in the woods mark the graves of the lost souls of a nearby asylum.

Astonishing collection of helmets, scientific instruments, and medical models.

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

Six peaceful acres in a residential neighborhood dedicated to art and peace.

One man's swirling six-acre monument of stone.

A peaceful international sculpture garden in upstate New York.

This giant rock arrived at this quiet park thousands of years ago on the back of a massive glacier.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

The lecture hall where Alexander Graham Bell first demonstrated the long-distance phone call.

She become one of the first women to serve in the United States military by secretly dressing like a man.

The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

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

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This park pays homage to the region's rich industrial history of brick making.

This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

This tower pays homage to a legendary Viking fort established in Massachusetts that never really existed.

The loneliest island in New York.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Rare recess caves fill this unbelievably beautiful Ohio park.

Lines from a walking song are etched into a rock in Natural Bridge State Park.