A once-glowing grotto at the bottom of Waikapalae Wet Cave.

Watch the newest land on the planet form before your eyes.

Learn about the history and craftsmanship of carousels inside this museum located in a former post office.

Lemon Grove, California is known for its giant lemon...and mummified bodies.

Every weekend, people gather here for a brief chance to see their loved ones on the other side of the United States–Mexico border.

San Diego's most historic and haunted home.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

Four cars from the old system were once on display, but were removed in 2014.

Residents of this Brooklyn neighborhood may be unaware their houses sit atop a buried trolley graveyard.

For 20 years, local pumpkins have met their fate on the iron fence surrounding this Cobble Hill home.

New York's southernmost subway station is whimsically wavy.

Feral cats keeping the rodent population at bay all across Greenpoint waterfront.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

An arcade packed with a rotating collection of unique independent video games.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Neon signs that grace the windows of Bergdorf Goodman's and Tiffany & Co. come from this studio in Brooklyn.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Sniff the Titan Arum's rotting flesh.

Ride the subways of yesteryear.

The phone booths of New York City have all but disappeared, but their remains were once found in this "graveyard," sadly now removed as well.

Visit the site of a subway powered by nothing more than air--and lots of it.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

This slender three-story building has also had several famous residents.

The first piece of public art dedicated to LGBT rights.