Tula Archeologic Area and Museum
These are the ruins of Tollan-Xicocotitlan, the ancient capital of the Toltecs. The site is stark and barren compared to sites like Chichen-Itza or Teotihuacan, but it holds enormous importance to historians because the Toltecs were the dominant society in Central Mexico for about 250 years (until the rise of the Aztecs in Tenochtitlan). The centerpiece of the site is Pyramid B with giant stone warrior statues on top and the long plaza of bare stone columns that once supported the palace roof. Another good size pyramid and two ballcourts round out the ruins. There is also a small museum with archaeological artifacts from the site (though most of the important and valuable pieces are displayed in the National Museum of Anthropology in Mexico City. The museum also serves as the site entrance where you pay the site admission fee.
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St Joseph Cathedral
The church was established as a monastery by Franciscan monks and constructed between 1543 to 1554. It was elevated to the status of a cathedral in 1961. The church has an unusual design resembling a fort more than a temple and is known for a remarkable triptych depicting the resurrection of Christ.