This image is a view inside the large cave complex, featuring an assortment of stalagmites and some smaller stalactites. Several have merged over the eons into continuous columns of stone.
The description states:
ONYX COLLONADE IN MAMMOTH CAVE
Mammoth Cave National Park, Kentucky
Stalagmites, stalactites, and columns are among the varied and interesting features of Mammoth Cave.
–These images can often make it difficult to identify up and down, but the ‘melted ice cream’ effect on the central column clearly indicates the downward flow of the mineralized water. This card dates from the 1950s.