main gates to the walls of nan madol - prehistoric ruined stone city. pohnpei, caroline islands, micronesia, oceania.

ancient archaeological archeology architecture basalt building canals castle city civilization culture federated fortification gates green heritage historical holiday island landmark landscape madol megalith megaliths micronesia monument mysterious nan ocean oceania old outdoor pacific palm palms pohnpei prehistoric rock rocks ruin ruined scenery site sky slabs states stone sunny temple tourism town travel unesco vacation water world