The Kahanu Garden in Hana Maui is one of two National Botanical Gardens in Hawaii. The other is in Kauai. This garden is a non-profit organization that survives on public donations, gifts from philanthropists, and revenue from tours. What sets this garden apart from all others is that it is home to the biggest heiau in the Pacific region. It's nine football fields long and four stories high. Yes. Hale O Piilani was built by the descendants of the great Chief of Maui, Piilani, who was instrumental in uniting the island of Maui under one rule. Archeologists found that the heiau was built in four phases starting in the 12th century and ending in 16th century at the time of Piilani's rule. The massive structure was restored in the 1990s by Bishop Museum and local families from Hana who volunteered their time and excavated and cleaned the site. The garden is beautiful. It's also home to a variety of plants of Polynesia.