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

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

A hidden subterranean installation offers a view of the sky.

The unbelievably opulent home built for an infamous newspaperman.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

The largest drain hole in the world.

Home with Gothic windows featured in a famous painting.

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

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

A wall of chewing gum moonlights as collective art.

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

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

See massive fossils that are over 200 million years old in northeastern Arizona.

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

The magic's in the hole!

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The largest self-built castle in the U.S., six decades in the making.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

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

One person's lost luggage is another person's treasure.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

A strange house built only at night, with rumored mystic inspiration.