Kahanu Garden also contains the 3-acre Piʻilanihale Heiau, a National Historic Landmark believed to be the largest ancient temple in the Hawaiian Islands. It is built from basalt blocks and extends 341 feet by 415 feet with a high front wall rising 50 feet he large central terrace with two separate platforms is situated on a broad ridge that adds to its majesty. The side facing the sea rises steeply in five stepped terraces, and the upper rectangular surface of the main platform contains several smaller walled enclosures and pits, all bounded on the rear by a well-built stone wall up to 8 feet high.Construction of the main terrace dates back to the 14th century. Wings were later added and rededicated during the 16th century, possibly after high chief Piʻilani from western Maui conquered the fertile, well-watered, and heavily populated Hāna region, thereby unifying the whole island.
Wailua Falls is the wildly popular waterfall along the Hana Hwy. Wailua Falls is about 80 ft. high