Monclova is not a touristic city and there are few significant sites in town. However, you may want to see:
Parroquia Santiago Apostol
Located on the city's central plaza is a 200-year old colonial style church. The sculpted greyish pink cantera facade and ornate iron gates are quite pretty.Museo de Tejas - Coahuila
Somewhat small historical museum chronicling the period of history when Texas and Coahuila were a single, gigantic northern Mexican state. Much of the museum is an historical library and the exhibit space is of peripheral focus.