This natural rock "church" might not be a proper chapel but that doesn't mean it's not beautiful.

A castle built for love, and abandoned due to heartbreak.

A winding, cliffside stretch of road overlooking the Delaware River.

Discovered by cows, these upstate New York show caves are presented with a healthy dose of psychedelic folk art.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

Protecting the future of some of the rarest and most misunderstood mammals of North America.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

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

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Once America's longest-manned military fort, now an abandoned hulk.

A natural gas leak provides a flickering flame beneath a waterfall.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

An abandoned castle owned and ignored by Masons carries a cursed history.

One of only two commuter aerial tramways in the United States.

A dilapidated dock tells the story of Titanic's missed arrival.

A crumbling hospital from the 1850s on Roosevelt Island.