A Museum of Holography frozen in 1974.

The park that the Chicago Stockyards built.

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

A stunning, abandoned limestone quarry in southern Indiana provided the stone to erect the Empire State Building.

Ornate limestone building now filled with geologic specimens, and more.

A medical facility that has been kept frozen in time.

A collection of relics from the Spiritualist Camp Chesterfield.

Visitors dip into a variety of pools of what was once ice.

London's most popular recording studio, located in the capital's East End, runs partly on solar power and has played host to some of the world's biggest acts.

Home to three historic ships from the age of Vikings.