Magin Towns in Mexico

In Mexico there are some towns called Magic Towns, they are places (with singular attractives each one?). I had the oppotunity to visit some of this Magic towns. My most recent visit was to Cuatro Ciénegas in Coahuila state,a little town where you can get up early in the morning and get a delicious breakfast in a restaurant. Then, you can visit Poza Azul, a beautiful zone where there are little lakes, where water looks blue. In this little lakes exists a unicelullar called, "estromatolitos". Those unicelullar made life possible in Earth. There are only three places in Earth where those unicelullar are still alive. NASA came to Cuatro Cienegas to study and investigate this unicelullar. Some time ago you could swin in this little lakes even on winter, because the water's temperature still warm always. Nowadays you can't swim in Poza Azul because it is a protected natural area. There are other interesting places like Las Dunas de Yeso, a desert where the sand is white because the sand is natural gypsum. You can visit Minas de Marmol, an old marble mine but it isn´t under the ground, it is in the highest point of a hill. You  can also swim in a river near the town and camp there if you want.