I really like old photos of Las Vegas. Most of the pics on that page remind me how the place looked when I first began going there in the eighties.
In some, you'll see the Frontier, which was the first Vegas hotel I stayed in. It was closed and then imploded in 2007. Every year or two since, someone announces plans to build a new mega-resort on that land…and then they don't build it. It's a pretty expensive piece of real estate to be sitting empty all these years.