Early prototype for Frank Lloyd Wright's Guggenheim.

Created in 1972, the famous sculptor's intricately detailed monument to San Francisco is overflowing with city landmarks.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

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

This historic California cemetery holds the bodies of veterans of both the Civil War and the Donner Party.

Miniature art that tells an enormous story.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

A Muppet museum in small-town Mississippi honors the roots of Jim Henson's most beloved creation.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

A rare view of a preserved Victorian science museum.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

In the early 1800s, surgery was also a show.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Ride the subways of yesteryear.

An illegally built ramshackle mansion tucked in the middle of Brooklyn is now being turned into condominiums.

A curious friendship between two inanimate ladies.

A mass grave for victims of one of the city’s worst fires.

19th century cemetery hidden in Brooklyn's Prospect Park.