Menehune Fishpond - Credit: Wikimedia Commons
The Alekoko Fishpond, known locally as the Menehune Fishpond, near Līhuʻe, Hawaii, on the island of Kauai, is a historic Hawaiian fishpond. Also known as Alakoko Fishpond, it has been listed on the U.S. National Register of Historic Places since 1973. Read more on Wikipedia
Source: en.wikipedia.org