This building has survived for more than a century and remains virtually untouched.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

This knobby, drooping New Orleans oak is a favorite place both for climbing and for meeting giraffes.

Collection of antique taxidermy and natural specimens, near one of Paris's oldest flea markets.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

The world's only museum devoted to the wonders of fluorescence.

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

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

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

Tenacious mummies survived dental problems, eternal entombment, and more than their fair share of devastating fires.