Board your air-conditioned transportation for the approximately 45-minute drive to the infamous mud volcano. On the way to the volcano, pass by the imposing San Felipe de Barajas Fortress situated outside the walled city. Here, you'll have the opportunity enjoy a panoramic view of the old city. Upon arrival at the mud volcano an orientation to the rustic facilities will be provided. A mud volcano is created by natural gases emitted by decaying organic matter underground. As the mud is pushed upwards by the gas, it deposits and hardens above ground and forms what appears to be a huge anthill. As more mud oozes out and spills over the edge it grows in size, gradually forming what you can see today: a miniature 50-foot volcano with a rich, creamy, mud crater at the top. If you have never been in a mud volcano before, then the initial feeling of mud on your skin is unusual to say the least. When you feel like you are about to become one with the earth, just climb back down the staircase and stroll down to the nearby freshwater lake where you can wash the mud off. Note: The temperature of the mud is very warm to hot, therefore those who are susceptible to heat must not participate on this tour. It's said that the mud has healing properties; however the truth to this statement is not proven. To reach the top of the mud volcano where the pool of mud is located, requires the negotiation of numerous, steep steps. Wear a swimsuit and bring a towel and adequate sun protection.