Figure 7.16 Religious pilgrims. Visitors number in the millions annually and can provide a holy site’s main source of revenue. Top: the grotto where the Virgin Mary appeared to a girl in 1858 in Lourdes, France. Middle: the Temple of the Emerald Buddha in Bangkok, Thailand. Bottom: the Great Mosque in Touba, Senegal. (Top: Franz-Peter Tschauner/dpa/Corbis; Middle: Kevin R. Morris/Corbis; Bottom: Richard List/Corbis.)