One of the more recognizable and bizarre roadside attractions in the country, Cadillac Ranch consists of 10 vintage Cadillacs (dating 1949-64) buried up to their back seats in a wheat field west of Amarillo, rising out of the earth at the same angle as Cheops Pyramid in Egypt. Conceived and funded by Amarillo's Stanley Marsh 3, the eccentric grandson of one of the Panhandle's most successful oilmen, Cadillac Ranch was constructed in 1974 by the Ant Farm, a San Francisco-based art collective, and relocated west in 1997 to its present site to escape the shadow of Amarillo's growth. Cadillac Ranch is also interactive: Marsh freely allows visitors to add their creative touches with spray paint, a marker, or a key.