2 Best Sights in San Miguel de Allende and the Heartland, Mexico

A Valenciana mine near the church has one entrance at Bocamina de San Ramón, whose inexpensive tour you might call entry-level—you just head down 66 feet, look around, and pop back up.

From 1586 until 1960 this mine supplied Zacatecas with most of its silver. Most tours are in Spanish, but props and dioramas within the individual caves (those that aren't flooded) help re-create a picture of the miner's life. Visitors enter on a little train, but there is walking, too, and plenty of steps; wear sturdy shoes and bring a sweater. There's a snack shop, a museum where you can see examples of different minerals and fossils, and, of course, the obligatory gift shop.