This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

World-famous, Pink's still manages to keep its prized cult fetish status.

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

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The site of the climactic scene from the classic horror film is now a historic landmark.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

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

A miniature rainforest is growing inside of a Midtown Manhattan office building.

A layered tribute to the work of mosaicist Isaiah Zagar.

Rippling sand dunes frozen in the Arizona rock.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A psychedelic labyrinth on the San Francisco bay.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

If Hello Kitty were Mickey Mouse, this would be Disneyland.

This small bridge serves as a symbol of South America's independence.

Known as the site of 'El Dorado,' this mysterious lake is rumored to hold gold beneath its waters.

A museum of memories in what was once one of the most violent cities in the world.

This colonial town in Colombia sits around the largest stone paved square in South America.