inside nan madol walls, masonry stonework of large basalt slabs. pohnpei, micronesia, oceania.

adventure ancient archaeological archeology architecture basalt caroline castle central city federated fortification heritage historic historical history holiday inside island islands jungle landmark large madol masonry megalith megaliths micronesia monument mysterious nan nandauwas ocean oceania old outdoor pacific part passage pohnpei prehistoric rock rocks ruin ruined ruins site slabs states stone stonewo stonework sunny tourism town travel underground unesco vacation walls world