Hidden on two floors of downtown building, the library has an incredible deal on rent.

The oldest brick house in the state of Ohio.

Inside, ancient treasures. Outside, modern contradictions.

The building is topped by a Statue of Liberty statue whose torch has stayed burning since the museum opened.

This elaborate estate contains a stunning marble aviary, a sunken conservatory, and a magnificent music room with a two-story pipe organ.

A medical facility that has been kept frozen in time.

This humble star-gazing center touts itself as the "Birthplace of American Astronomy."

This collection of Japanese luck idols beckons visitors with over 2,000 waving paws.

An abandoned relic of the city's failed experiment with below ground transit.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

San Francisco's most expensive hotel suite includes a secret passageway rumored to have been used by JFK.

Tiki luxury on Nob Hill.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

An invitation-only museum of items natural and bizarre, arcane and exotic.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Olfactory delights in San Francisco's Botanical Gardens.

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

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

A winding path built in secret on the edge of the continent.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A huge musical instrument played by the ocean.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A psychedelic labyrinth on the San Francisco bay.

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