Hoover Dam
I briefly got to visit Hoover Dam on a business trip to Las Vegas. Like the Taj Mahal, it was utterly surreal to see it in person after seeing photographs everywhere since childhood.
I know that dams are generally not great for the environment, but wow, they are incredible pieces of engineering and human accomplishment.
I cannot imagine what it took to build this dam – and even maintain it to the present day. I hope to visit again when I can see the museum and take a tour.