| 1. |  | Abode of the Farries, Tower of Babel, Crystal Cave, Elk Creek Canyon, B. H. & Ft. Pierre R'y. | Rock formations; Crystal Cave (S.D.); | Interior view of the Abode of the Farries (Faeries?), the Tower of Babel in Crystal Cave, S.D. Printed on front ends of mounting board: Black Hills, the Switzerland of America. Reached by the Northwestern... |
