Łomża is a town on the Narew River in Podlaskie Voivodeship. Its landmarks include the Old Market Square (Stary Rynek) with its townhouses and the Cathedral of St Michael the Archangel, while the Jesuit college founded in 1614 gave rise to one of the oldest secondary schools in Poland. We prepared a mobile app for Android and iOS phones with two sightseeing routes: a shorter one around the Old Market Square (approx. 1.5 hours) and a longer one that goes beyond the Old Town (approx. 3 hours). GPS and offline maps make it easy to find each successive stop. The audio guide is available in Polish and English.