The mysterious prehistoric city

"Venice of the Pacific: The ruin consists of 92 artificial islets built on top of coral reefs, which are linked by a network of canals.

The meaning of the real name - "Nan Madol" means "the space in between," which references the canals.

The million dollar question: Why would someone build a city in the middle of the ocean.

One thing is for certain: It’s an engineering wonder, built entirely of giant basalt slabs in a time.

Impressive scale: The massive basalt walls are reportedly 25 ft (7.6 m) tall and 17 ft (5 m) thick in some places.

Megalithic architecture: Carbon dating indicates that some of the structures are around 900 years old.

Humans were there earlier: Evidence of the earliest human activity dates back to the first or second century BCE.

Where did all that basalt come from: The basalt stones are reported to have come from the opposite side of Pohnpei.

How was it transported: Modern archeologists have no idea how the massive stones.

It rivals the work of the pyramids: The effort required to build the megalithic structures would have rivaled that of the Egyptian pyramids.

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