Trips into this cave complex used to see visitors pay 25 cents a time to be lowered down by rope (and take their own light source), today there's an elevator to whisk you 210 feet underground. There's a choice of tours through the illuminated caverns, including a wheelchair accessible trail and it's possible to get married and even spend the night on one of the caves. A whole enterprise has been built around the caverns, including motel, restaurant, gift shop and RV camping.
If you go:
Underground tours last 45 minutes and depart every half hour; open daily except Christmas Day.
Links:

Route 66
22 miles northwest of Seligman
Peach Springs, Arizona 86434 USA
info@gccaverns.com
Mailing address:
Grand Canyon Caverns
P.O. Box 180
Peach Springs, Arizona 86434-0180 USA
Phone Numbers:
Caverns
+1 (928) 422-4565
+1 (928) 422-4565
Hotel
+1 (928) 422-3223
+1 (928) 422-3223
Tags:
grand canyon,
peach springs