You can have a private sauna room for M$42-46 per hour. Or go into the common sauna for M$35. Open F-W 08:00-20:00, Su 08:00-16:30
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Los Tuneles
An entry to historic tunnels that lead to the forts.
A neighborhood near the forts with lots of murals from artists all over the world. It's easily accessible when going through the tunnels, which briefly surface in the neighborhood.
Templo de Santo Domingo, Rosary Chapel
One of the most extravagantly opulent churches in Mexico, this small chapel has been called "The Eighth Wonder of the World" (or "WOW!" for short). The sheer quantity of gold covering virtually every surface of the altar, walls, and dome is jaw dropping, but the extravagance goes further with elaborate talavera tilework and iconic statues and paintings everywhere.
National Museum of Mexican Railroads
One of the largest train museums in North America with a great location in an historic train station. Lots of locomotives and rolling stock. Many of the railway cars are open for tourists to enter. Most signage is in Spanish only.
Puebla's historic downtown contains beautiful colonial architecture and was granted UNESCO world heritage status in 1987. The Zocalo is the central plaza is a place to enjoy, where you can find restaurants, bars and cafes.