Earth Room

The New York Earth Room is an interior sculpture by the artist Walter De Maria that has been installed in a loft at 141 Wooster Street in New York City since 1977. The sculpture is a permanent installation of 250 cubic yards of earth in 3,600 square feet of floor space, and 22 inch depth of material. The installation has had the same caretaker, Bill Dilworth, since 1989, and is maintained by the Dia Art Foundation who consider it one of their 12 locations and sites they manage.

Source: Wikipedia