I mean really...it's the Hoover Dam! It has a 2,000 year predicted shelf life...yes it's going to be around as long as the pyramids. They literally etched in the location of the planets when it was built so that way people 2,000 years from now will know the time it was constructed. Pending some type of nuclear war this dam will be a great example to society to come of what the American people were able to accomplish.
You need to visit this place and make sure to get up on the overlook bridge for a pic.