Wilderness, Alaska

The claim: East of Anchorage. No roads, Air & Railroad access only. Estimated capacity of 500,000

What it really is: I was about to brush this off as being not having enough information, but I decided to go to one of these FEMA camp websites that actually had the location pinned on Google maps, and I took a look at the pinned location in satellite view, and the only things I found around there were a few houses and roads,  a highway, and nothing that can hold half a million people.