With the arrival of the Livonian Order and the crusading campaigns of the 13th century, Latvia’s landscape changed. Stone began to replace timber, and military architecture took on the precision and permanence of European fortification standards. Many castles, like those in Cēsis, Koknese, and Aizkraukle, included high watchtowers from which the surrounding terrain could be surveyed. These towers had narrow arrow slits, spiral staircases, and walls thick enough to resist siege engines. They were rarely stand-alone structures; instead, they formed part of an integrated defense system that included ramparts, gates, and bastions. In Cēsis, for example, the castle’s round towers provided not only defensive oversight but a kind of psychological presence, asserting Christian and foreign rule over newly subdued Baltic lands. While much of that architecture now lies in ruin, the vertical ambition of these towers still commands the imagination, drawing visitors and reminding them of Latvia’s medieval turbulence.