Concrete is one of the longest-lasting man-made materials you can use. In fact, some buildings made of concrete are still standing after thousands of years. The Hoover Dam, the Panama Canal, the Roman Pantheon and the Roman Colosseum are all made of concrete, and they are still going strong even after so much time has passed. The Hoover Dam and the Panama Canal are exposed to trillions of gallons of water, and they stand up to the elements.

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