Craters of the Moon National Monument has Dewdrop and Beauty Caves. But there's also a sleeping beauty turqouise mine in AZ. Still, I went with the monumental hole in the ground. Cowgirly, don't feel too bad. We all made stupid mistakes. But so far, you've got the second best answers I've seen so far. Right behind me.
I still think it's Assault. As for Armadillo World Headquarters, I thought that , too, because of the christmas bazaar which changes locations every year, but then I started thinking that heads and hindquarters had to do with livestock and found out that an American Purebreed Cattle originated in Texas and now has several headquarters in Australia, as well as homes in many other places in the US and World. Still haven't seen my wonder yet. It's actually a city with a real name. Or my Penny in the Park. It doesn't even have the word penny in the answer.