Visible below the waves are memorials to the city's Gold Rush dead.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A ghost town at the airport is now a refuge for blue butterflies.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Tubing through a cave lit with glowworms is a magical underground experience.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

A very classy 1920s-era bar right in Grand Central Station.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A meditative space out of a fantasy story.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

A clear blue swimming hole with hidden caves, still unexplored.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.