Rare karst landscape eroded from a flat seabed.

A Spanish town built into the cliffs.

This botanical garden outside Chicago boasts an array of more than 300 varieties of lilacs.

First planned industrial community in the United States.

Built to house a chapter of the Knights Templar, this grandiose building is a relic of Freemasonry in Chicago a century ago.

A European-style bath house in Chicago.

The subtle science of a master molecular gastronomist.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

Once at the center of U.S. finance, the historic Trading Room was meticulously recreated piece by piece and rebuilt in the Art Institute.

A Museum of Holography frozen in 1974.