Popular Mechanics has a photo slide show of man-made islands. Some of the islands are most interesting, some are made out reeds, PET botttles or even an oil drilling island.
Since the ancient Aztecs geoengineered the shoreline of Tenochtitlan, their island capital that became Mexico City, humans have raised land from the water. The prehistoric geoengineers built an island to create a fertile space for farming, but now fake islands abound—and their reasons for existence are not so obvious. Here are 18 of the world’s strangest artificial islands.