The Neptune Pool is the name of the outdoor swimming pool ensemble at Hearst Castle, in San Simeon, California. Featuring the significant swimming pool, it also includes: fountains, ornamental pools, sculptures, marble pavilions, alabaster lanterns, dressing rooms, and an ancient temple facade (mainly reconstructed). The Neptune Terrace, including its huge pool shell, are raised up behind massive retaining walls on the Hearst Castle ridge-line in the Santa Lucia Mountains.