Piilanihale Heiau
This temple, the largest heiau (stone temple) in Polynesia, was built for a great 16th-century Maui king named Piilani and his heirs. Hawaiian families continue to maintain and protect this sacred site as they have for centuries, and they have not been eager to turn it into a tourist attraction. However, there is a brochure that helps you to tour the property yourself. The heiau is within the 122-acre Kahanu Garden, a research center focusing on the ethnobotany of the Pacific.