"Grant's Tomb"
Back in the late 1800s the original owners of the cave used to give tours of the cave. They used to sell rocks as souveniers, and let people carve their names onto a rock and throw it onto one of three piles. They were for Abe Lincoln, Ulysees S Grant, and Robert E Lee. This is a picture of some of the rocks from Grant's pile (the biggest). Robert E Lee's pile was collapsed, and apparently refused to stay standing no matter how many times it was reassembled.