This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

The massive, original Colgate Clock is mounted on a defunct factory building that was once a prison.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

This municipal playground was co-created by the father of one of the most playful characters ever.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

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

A man-made island in scenic San Francisco Bay.

Tiki luxury on Nob Hill.

Only hotel where you can legally launder money.

The world's first permanently occupied mountain-top observatory continues to report on the stars.

From the Difference Engine to the Cray-1, all under one roof.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A giant chess set, minus the psychedelic drug trip.

This giant shopping mall still holds signs of its automotive past.