These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

A B&B on a Victorian lighthouse station in San Francisco Bay.

A poignant memorial to a young boy whose death spurred a dramatic increase in organ donations in Italy—dubbed the "Nicholas Effect."

The largest Star Wars collection in the world is its own galaxy of collectibles.

This cave was hidden for thousands of years, storing the worldly goods of ancient Native Americans.

A century and a half of research in the sciences and natural history, still going strong.

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

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A museum befitting the city responsible for supplying the majority of the world's LSD.

The tea room that pushed the boundaries of adorable straight into...we can't find the words.

These subterranean storage areas hold emergency water reserves.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.

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

An overlooked and unassuming engineering marvel.

San Francisco’s century-old Christmas Tree.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

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

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

Strange secondhand shop showcasing taxidermy and oddies

A former plague hospital turned medical museum.

Amsterdam's Red Light District leaves little to the imagination.

A curious collection dedicated to human and animal anatomy and pathology.