Nandauwas
Walls up to 7.5 m.
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Nan Madol is an ancient city on the east coast of Pohnpei in Micronesia. High walls of black basalt columns, stacked crosswise, stand on small man-made islets in the lagoon, with tidal canals between them and forest growing over the stones. Nan Madol was the capital of the Saudeleur dynasty, which ruled Pohnpei until about 1628. It has 92 artificial islets of stone and coral fill over an area of about 1.5 by 0.5 km. Building of the great walls began around 1180. Its name means «within the intervals», a reference to the canals, and a local legend says two sorcerer brothers lifted the stones into place. It was added to the UNESCO World Heritage List in 2016. The best-known sight is Nandauwas, the royal burial islet, where walls 5.5 to 7.5 m high surround a courtyard with a central tomb. You walk among the plant-covered walls and see the canals and islets around you. Nan Madol is about 19 km in a straight line southeast of Kolonia. You drive and then walk a trail across private land, and may wade through shallow water to the islets, or come by boat on a tour at high tide. Ground and stones are slippery, so wear proper shoes, and do not climb the walls.
Walls up to 7.5 m.
Stacked crosswise.
Between the islets.
Off Temwen Island, Madolenihmw municipality, east coast of Pohnpei
You can walk to the nearer islets; a boat tour at high tide reaches more.
No, they are ancient and slippery.