mexico: guanajuato
A couple of hours north of Mexico City, the beautiful old city of Guanajuato is tucked away in the mountains. With one of the richest silver mines in the world (20% of the world's silver was found here), it's historic center is an open-air museum of colonial architecture. One of the reasons the town has such a picturesque and tranquil atmosphere is that most traffic is led through a network of tunnels underneath the city.
