The most important tourist attraction of the city is the Great Pyramid with the Nuestra Señora de los Remedios sanctuary on top. At first glance, the pyramid looks like a hill as most of it is overgrown. The south side of the pyramid has been excavated and there is a network of tunnels inside. The pyramid and church receives about 220,000 visitors each year, and on certain special occasions such as the spring equinox and the feast of the Virgin of the Remedies, there can be up to 20,000 visitors at a time. From the top of the pyramid, in the sanctuary atrium, it is possible to see the Malinche, Popocatepetl, Iztaccíhuatl and Pico de Orizaba Volcanoes in the far eastern horizon.