Cape May, the nation's oldest seashore resort, is located on the southernmost tip of the state surrounded by the Atlantic Ocean and Delaware Bay. Popular with Philadelphia and New York society since 1766, Cape May has been host to Presidents Lincoln, Grant, Pierce, Buchanan, and Harrison, as well as notables such as John Wanamaker and Horace Greeley. The entire town has been proclaimed a National Historic Landmark because it has more than 600 Victorian homes and buildings, many of which have been restored. The downtown Washington Street Victorian Mall features three blocks of shops and restaurants. Four miles of beaches and a 1 1/4-mile paved promenade offer vacationers varied entertainment. "Cape May diamonds," often found on the shores of Delaware Bay by visitors, are actually pure quartz, rounded by the waves.