Just 20 miles from my mother-in-law's house is The Mammoth Site museum in Hot Springs, SD. The museum itself covers an actual excavation and research site. Buried in the hill are dozens of mammoths and other animals which came to a steep-sided, spring-fed sinkhole for a drink or a bath -- and found they could not get out.
"Since 1974, 58 Columbian mammoths and three woolly mammoths have been unearthed, making this the first site both species have been found together. Eighty-two species of ice-age animals have been discovered, including camel, llama, giant shortfaced bear, wolf, coyote, and prairie dog."
But the best thing about The Mammoth Site is that kids get to participate!