Museu de Leiria is the city's main museum and a useful introduction to the region before or after visiting the castle. Its galleries bring together archaeology, sacred art, local history, and objects that explain Leiria's role between central Portugal's coast, monasteries, and inland towns.
The museum is not large, but it gives structure to a Leiria visit that might otherwise focus only on the hilltop fortress. It works well as a cultural stop on a rainy day or as part of a slow walk through the historic centre.