The Texas Historical Marker onsite. . .
. . .a map of the caverns inside the museum. . .
. . .info about the tour. . .
. . .another map, featuring the rock formations underground. . .
. . .pictures of the original exploration in 1963. . .
. . .this display speaks of climate and geology of the southwest US over the last 70,000 years or so. . .
. . .this was the original hole drilled during the I-35 build that discovered the caverns. . .
. . .various scenic formations in the caverns. . .
. . .the tram heading out of the caverns.