Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

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

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

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

San Francisco's newly reopened hands-on science museum.

A walk-in working camera obscura produces 360-degree live images of the San Francisco coast.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

A huge musical instrument played by the ocean.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

Near the ruins of a Civil War coastal fortress lies the only known African refugee cemetery in the United States.

The museum chronicling a treasure hunter's dream, fulfilled.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The island residents are known for taking their quirky sense of humor with them to the grave.

"We Seceded Where Others Failed."

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

A monument celebrating the idea of reaching inaccessible places.

Florida's oldest bar was once a morgue, complete with a hanging tree and gravestones.

Here’s how Robert the Doll earned his reputation as the most haunted doll in the world.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

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

Clean, cold drinking water flows from a nondescript pipe in a roadside rock face.

During the summer, surfers in Alaska take advantage of this inlet’s unusual water patterns.

Colorful boxes placed over the dead are left to rot and crumble.