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

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A snapshot of the city's fascinating voodoo culture.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

A still functioning vaudeville carousel that has operated for over a century boasts a colorful menagerie and past.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.

It is locally loved and ridiculed for literally looking like poop.

A giant chess set, minus the psychedelic drug trip.

A pair of pure white felines guard the entrance to a spot of California real estate established as an artist's haven.