Gold Rush-era tombstones line the park's paths.

A hidden subterranean installation offers a view of the sky.

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

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

Steinbeck's old stomping grounds, immortalized in Cannery Row.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

Once an ornate movie theater remade by Catholic Charities.

A spectacular remnant of an Adler and Sullivan masterpiece that was destroyed in 1972.

Combination beer garden and music venue in the heart of Wicker Park.

This titanic java kettle is one of the many kitschy landmarks located along America's OTHER famous highway.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

Mysterious rocks that ring musically when struck.

Where America's first doomsday cult awaited the end of the world.

A toxic ghost town sitting atop a massive coal fire.

World's first "penitentiary," meant to be humane, drove men insane.

Creaky dinosaurs grow in the backroads of Monmouth County, New Jersey.

An enormous overgrown greenhouse teeming with graffiti and wildlife.

This hospital fell into ruins after failing to act as the advocate for the mentally ill it was designed to be.

A billionaire heiress' menagerie of animals were lovingly laid to rest on the grounds of her former estate.

Filled with history, this cemetery is maintained each summer by a few hungry goats.

This crumbling little graveyard was saved from the undergrowth by concerned veterans.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

Seven people are buried in the middle of what's now a movie theater parking lot.

An allegedly cursed tree represents a town's reckoning with a racist past.