"A colossal underwater sinkhole encircled by a ring of coral about three hours by boat off Ambergris Caye, this dramatic site stretches nearly 1,000 feet across and plunges roughly 400 feet deep; it offers world-class diving with colorful fish, shrimp, groupers, and sharks and is also popular for helicopter flights that deliver spectacular aerial views and photos." - Patricia Doherty Patricia Doherty Patricia Doherty is a writer who specializes in covering destinations, resorts, and cruises for Travel + Leisure and other publications. Travel + Leisure Editorial Guidelines