The name of this famed hospital was once a byword for the horrors of medical and psychiatric care.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

One of only two commuter aerial tramways in the United States.

Tracks near this Texas nature site were once thought to support the Creationist belief that man and dino coexisted.

A modernist landscape of water and sci-fi concrete.

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

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

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

Faceless white figures loom over the city from the rooftop.

A brooding mansion of clinker brick stands out among the Victorian houses of Pacific Heights.

Recovered from the brink of extinction, at home in the Financial District.

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

27-room home built with the fortune of a sugar magnate.

Nestled in the heart of San Francisco’s bustling Financial District stands a unique homage to the Mayan and Beaux Arts.

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

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

Only hotel where you can legally launder money.

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

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

Home of modern dancer famously strangled by her own scarf.

The miraculous hydrant that saved the Mission District in 1906.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

These subterranean storage areas hold emergency water reserves.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.