Colorized view of cave formations inside Great Onyx Cave, with a tall stalagmite resembling the Leaning Tower of Pisa. Other stalactites and stalagmites are visible in the background.
Linen texture visible; no white border; printed caption in white; number 6B-H416 at lower right.
No postmark, stamp, or handwriting on the back. Undivided back with 'PLACE ONE CENT STAMP HERE' box; C.T. Art-Colortone linen-textured stock. Printed imprint names Curt Teich, Chicago, and Mrs. W. P. Cox, Mgr., Great Onyx Cave and Hotel, Mammoth Cave, KY.
Cite this card
Leaning Tower of Pisa formation, Great Onyx Cave, Mammoth Cave National Park, Kentucky, postcard, n.d.. PostalPast Collection. https://postalpast.com/postcard/leaning-tower-of-pisa-formation-great-onyx-cave-mammoth-cave. Accessed October 5, 2026.