Two long open tour boats with rows of wooden seats sit on the green water of Crystal Lake, an underground lake inside Mammoth Cave. Artificial lights pick out the lake's emerald surface and the golden-tinted rock walls and dome above. Mammoth Cave, in south-central Kentucky, is known for its underground rivers and lakes, and the boats were part of the guided tour through the cavern.
Color photo postcard, likely chrome era; no white border visible on front. Printed caption at upper left reads "CRYSTAL LAKE IN MAMMOTH CAVE / Mammoth Cave National Park, Kentucky," with descriptive text below crediting color photos by W. Ray Scott and J. W. Young; series NPC-9. No postmark, stamp, or handwriting present — unused printed back. Divided-back chrome-era card (Mirro-Krome by H.S. Crocker Co., Inc., San Francisco 1, Calif.); glossy surface. Publisher imprint at bottom, plus "Published by National Park Concessions, Inc., Mammoth Cave, Kentucky"; printed "address" / "place" and "stamp here" headings on back.
Cite this card
Crystal Lake, Mammoth Cave National Park, Kentucky, circa 1950, postcard, c. 1950. PostalPast Collection. https://postalpast.com/postcard/crystal-lake-mammoth-cave-national-park-kentucky-circa-1950. Accessed November 2, 2026.
