Developed in 1894, Sutro Baths was the largest public indoor swimming pool complex on earth. Adolph Sutro, a wealthy businessman, built this to provide thousands of San Franciscans with a healthy, recreational, and inexpensive swimming facility. The power of the Pacific Ocean during high tide could fill the 1.7 million gallons of water required for all the pools in just one hour. The Baths could accommodate 10,000 people at one time and offered 20,000 bathing suits and 40,000 towels for rent.