New York City's smallest piece of private property.

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

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A hip bar decorated with walls of golden skulls.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

One of 100 “Whaling Wall" murals painted in 13 different countries by a renowned marine life artist.

Restaurant in a 1741 farmhouse that touts the story of its haunting on its menus.

Maybe the only missile installed in a public park, this Cold War leftover was one of the first to carry a nuclear warhead.

Come for the gun-toting hillbilly madman, stay for the ice-cream loving basketball bears.

The only one of New Hampshire's original 14 World War II watchtowers to survive in near-original condition.

Former abode of notable poet, complete with literary references and stories of ghosts.

Even Henry David Thoreau found this glacial pothole irresistible.

Dozens of rockets and missiles are on display outside a testing facility in the Utah desert.

The last SR-71 ever constructed.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Jurassic Park—A Still Life.

This ancient cave is home to a museum, bar, and is filled with fluorescent minerals.

A sculpture for the sun and stars, created by Nancy Holt.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.