Three columns in Island Ford Cave near Covington, Virginia (USA). For scale, the columns are about two feet tall. This model was developed during an undergraduate hydrology class and was our first attempt at digital photogrammetry inside of a cave. Photography by Murtaza Kapasi (https://sketchfab.com/murkap), photogrammetry by Dave Pfaff (https://sketchfab.com/dpfaff), and annotations and upload by Elliot Helgans.