You can learn about the history of Condeixa-a-Velha e Condeixa-a-Nova with a trip to Conímbriga Ruins. While you're in the area, stroll along the riverfront.
You can spend an afternoon exploring the galleries in Casa Museu Fernando Namora during your trip to Condeixa-a-Velha e Condeixa-a-Nova.
You can spend time browsing the exhibits at PO.RO.S - Portugal Roman Museum in Sicó during your trip to Condeixa-a-Velha e Condeixa-a-Nova.