[Nan Madol](http://whc.unesco.org/en/list/1503) is a series of more than 100 islets off the south-east coast of Pohnpei that were constructed with walls of basalt and coral boulders. These islets harbour the remains of stone palaces, temples, tombs and residential domains built between 1200 and 1500 CE. [more detail](http://whc.unesco.org/en/list/1503)
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**World Heritage Site**: At present, there are 1121 heritages listed by [UNESCO](http://whc.unesco.org/en/list/) in the world. We have created a [CryptoStamp](https://cryptostamps.cc/) for each heritage and hope to store these 1121 miracles of the earth and mankind permanently on the blockchain.