The city of Nan Madol was built between 200 B.C. – 800 A.D., on a coral reef near Micronesia. It consisted of about 100 artificial islands made from huge basalt blocks and connected with viaducts. From the start, it dazzles us with a mix of the bizarre and grandeur. From the start it seems incongruous; 250 million tons of offshore basalt in the middle of nowhere.