A supermarket shopping cart.
The subject of a famous legend regarding a rich gold mine in the Superstition Mountains-likely exaggerated, but based on the life of "forty-niner" Jacob Waltz in the 1800s. Some people still venture into the mountains looking for the hidden 'treasure'.
This has become the popular name for Millenium Park's famed stainless steel sculpture, "Cloud Gate." It was completed in 2005.