#28: Vast Drop
Again, while megalophobes will struggle a bit, it’s the acrophobes I’m genuinely concerned about, and maybe the aquaphobes as well. Built from 1933 to 1936, the Hoover Dam is 726.4 feet tall and 1,244 feet wide. It’s the largest dam in the world and holds back millions of tons of water which are then released on a schedule to generate electricity.

Phasmaphobes should beware as well. Over sixteen men died during the build due to heat exhaustion, and another 80 from falling debris and construction accidents. That’s a potential 96 ghosts to deal with if you visit. It’s open to the public from 9-5 every day and gets nearly a million visitors each year.