Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

The site where a nuclear bomb was lowered over 8,000 feet underground and detonated as an experiment in natural gas extraction.

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

Metal water storage tank turned ethereal concert hall.

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

A library built during San Francisco's pioneer times is a student's retreat, bibliophile's sanctuary, and chess player's delight.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

A modern mechanical planetary system, part of a 10,000 year clock.

Tiki luxury on Nob Hill.

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

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

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

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

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

The private clubhouse for the members of the Academy of Magical Arts.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Providing the soundtrack to the golden years of the Seattle grunge scene.

This Seattle museum displays the history of the telephone through an impressive collection of telecom equipment.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The site of the climactic scene from the classic horror film is now a historic landmark.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.