Most of the tombs are not open to the public (18 of the tombs can be opened, but they are rarely open at the same time), and officials occasionally close those that are open for restoration work. The number of visitors to KV62 has led to a separate charge for entry into the tomb. The West Valley has only one open tomb—that of Ay—and a separate ticket is needed to visit this tomb. The tour guides are no longer allowed to lecture inside the tombs, and visitors are expected to proceed quietly and in single file through the tombs. This is to minimize time in the tombs and prevent the crowds from damaging the surfaces of the decoration.