City is a land art sculpture by Michael Heizer in Garden Valley, a desert valley in rural Lincoln County in the U.S. state of Nevada. More than a mile long, it is the largest contemporary artwork ever built. It was begun in 1972, took 50 years to complete, and cost an estimated $40 million. City is maintained by the Triple Aught Foundation and opened on September 2, 2022, to limited, reservation-only viewing by a maximum of six visitors per day.