At the time of its completion, it was the tallest dam in the world.

This shallow pit was once used to send over 20,000 buffalo plummeting to their death.

A small town built on an abandoned airfield has former runways as streets and a bar and grill in an old airplane hangar.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

An architect's childhood fantasy treehouse made real.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

One man's ambition created this psychedelic log home.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

The first declared National Monument in the United States.

Once thought to be the fabled Holy Grail, it is now known to be an oil lamp.

Commemorating the spot where the famous scientist fed his pigeons.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

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

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

There are owls with glowing eyes in Herald Square.

This iconic tattoo shop has its own onsite museum with artifacts from the early history of modern body art.

A dark patch of the ceiling at Grand Central Terminal which was not restored is still stained brown by tobacco.

The former hotel where Tesla invented the radio.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.