Kilauea Lighthouse on Kaua'i in Hawaii
We've been to Kaua'i a couple of times and it's on the list for a few months from now. It was such fun to come across the Kilauea Lighthouse not far from Princeville where we were staying back in 2013 (and we could see this in the distance from our condo balcony) especially since, having lived many years in New England, we often enjoyed seeing the many lighthouses along that coast.
Coincidentally at the time the lighthouse was closed - this was during the time of the US Government shutdown in October 2013 that also affected the National Park Service. Perhaps we'll be able to really visit up close and personal on this next trip.