Spelunking sites are underground locations that are explored by spelunkers, or cave explorers. GROTTOES, which have 8 letters, are natural or artificial CAVES that are often decorated with formations such as stalactites and stalagmites. CAVES, which have 5 letters, are large underground openings that are formed by the erosion of rocks. GROTTOS, which have 7 letters, are similar to GROTTOES but are usually smaller and more shallow. All three of these spelunking sites provide a unique and exciting experience for those who explore them.