Montana boasts a very unusual cluster of 9 natural bridges within 300 yards of each other. Known as the Calypso Cluster, the bridges are located in a wilderness study area in the Terry Badlands about 20 miles northwest of Terry, Montana. They were reported by Larry Fogleman, and the photo above by Ray Millar shows three of the bridges. The double arch in the foreground has a span of 25 feet. The other two bridges in the photo have spans of 35 and 60 feet respectively.