An 18th century star fort built by the Savoy family very close to the city center.
Monferrato is a hilly area just north of Alessandria where some of the best wines in the world are produced. Especially if you have a car it might be nice to try out the restaurants and wineries in the area. Monferrato offers a lot of different options but we recommend visiting especially Vignale Monferrato.
A Roman thermal town, if you want to relax and see some Roman ruins.
One of the biggest designer outlets in Europe, easily reachable from Alessandria with public transport.