Guba
Contributor
And though this one isn't a traditional "scuba park", it is dived and is fairly unique. Vahalla Missle silo near Amarillo, Texas. That's just what it is, too...a retired nuclear missle silo left over from the cold war, about 120 feet deep and pretty much filled with COLD very clear water that naturally seeps inside. Not too much to see, but what an unusual logbook entry!