The trip along the Road to Hana on the island of Maui is without a doubt one of the most visually interesting excursions I have ever taken. This is due in no small part to how old it is. The often single lane road winds through the jungle, crossing over 59 bridges along the way.
And then there is this structure, an old aqueduct. I have no idea if it still serves a functional purpose, but water continues to run through it nonetheless.