The red-brick tower on Gediminas Hill is the most recognizable symbol of Vilnius. What remains is the western tower of the Upper Castle, originally built in the 14th century and one of the earliest Gothic structures in the city. The castle's history is inseparable from the founding of Vilnius itself — legend has it that Grand Duke Gediminas dreamed of an iron wolf howling on this hill, prompting him to build a fortress here.
Inside the tower, a small museum traces Lithuania's history from the medieval Grand Duchy through the occupations of the 20th century. The real draw is the observation platform on the roof: the panorama takes in the Old Town's church spires, the Neris River, and the modern skyline of Snipiskes across the water. You can walk up the path from Cathedral Square in about ten minutes, or take the funicular (€2) if you'd rather save your legs. The hill is especially popular at sunset.