The Old Mount Rushmore
Before Mount Rushmore was carved into a Native American mountainside in South Dakota, the sculptor had to make a much smaller replica. The presidents were originally going to have their entire torso sculpted into the mountain, but they decided to forgo that idea. It's interesting to see the original idea for the design.
Another Forest Bunker
This bunker looks like it's abandoned, but it's not! It actually houses a lot of underground storage and facilities for the US government. The weirdest part? It's located somewhere deep in a Virginia forest. It's difficult to find unless you know exactly where it is, and it's totally restricted to anyone other than high-class officials.