The unique features of city of Guanajuato are underground tunnels. The first one was dug back in colonial times. Originally, they were used for flood control, later carved into the rock tunnels were transformed into underground roads and streets. The city is filled with countless colonial era buildings standing along the narrow streets, small squares and adjacent to the old churches. There is a nice atmosphere in the city thanks to street artists, dealers, and many tourists. One day in the city was as was enough for us. We missed adventures and secluded, peaceful places. Our next stop, the old mining town located high in the Sierra de Catorce Mountain range.

Real de Catorce located is on a mountain slope at an altitude of 9,000 ft / 2,750 m above sea level. However, it is not hard to get there. From the plateau, 27 km / 17 miles long cobblestone road climbs high into the mountains. The narrow, one-way tunnel is the only way to access town from that side. A fee of 20 pesos (1.3 USD) gave us permission to travel through more than 100 years and 2.4 km / 1.5 miles long underground corridor. Ogarrio Tunnel is too low for large trucks, but Balios fitted there without a problem. We noticed trucks parked at the entrance to the underground road. For the products to can reach the village, the entire load must be moved to smaller pickup trucks.