Keywords: Coba-C-Pyramid.jpg Tourists climbing the large pyramid at Cobá group c Yucatán http //www astrosmo unam mx/~r lachaume/fotos/yucatan/coba-group-C-pyramid-01 jpg 2006-04 Régis Lachaume http //www astrosmo unam mx/~r lachaume/fotos/yucatan/LICENCE Cobá - Grupo Nohoch Mul Mesoamerican pyramids |