Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

Rippling sand dunes frozen in the Arizona rock.

A library of rare occult books in Los Angeles.

The last of its kind in the country.

A reproduction of earth's many biomes.

Storybook cottage in Beverly Hills was once the site of 1920s silent film studio, affectionately known as "The Witch's House."

The collection of ceremonial and cultural objects spans many countries and hundreds of years.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

A hotel and restaurant serving as the mecca of kitsch.

A modern day curiosity cabinet.