Hwy 520, the Maluhia Rd, is the route to get to
Poipu and
Koloa on Kauai's east side. Visitors can drive through the Tree Tunnel which was planted with swamp mahogany and eucalyptus. They grew and formed a tunnel over the road.
Hurrican Iniki in 1992 damaged the "roof" of the tunnel and many of the trees do not intermesh at the top, but they are growing back. The mature trees stretch for more than a mile along this route.