The Grazer Hauptplatz (main square) forms the central heart of the old town and is one of Graz's most important sights. Since its creation by Duke Ottokar III around 1160, magnificent late Gothic, Baroque, and Biedermeier façades have dominated the cityscape. To the south rises the neo-Baroque town hall, whose current façade was built between 1887 and 1893 and serves as the center of urban representation and administration.
In the open center of the square stands the Erzherzog-Johann-Brunnen (fountain for archduke Johann), a bronze statue of the Styrian prince (1782–1859) unveiled in 1878, set on a pedestal with four allegorical figures representing the rivers Mur, Enns, Drau, and Sann. Around this sculpture treasure, mobile market stalls daily open up the colorful hustle and bustle: hot sausages, roasted chestnuts, ice cream, and regional specialties recall the original marketplace character, the city portal of the provincial capital.
Architecturally, the main square presents a vibrant panorama from several centuries with richly decorated residential buildings. Notable highlights include the Luegg House with ornate stucco and arcaded walkway, as well as Baroque arcade houses. The trapezoidal layout has been adapted by new town hall constructions in the 16th and 19th centuries.
From the square, footpaths lead to Sporgasse, Herrengasse, Schmiedgasse, and the Rose Garden on the Schlossberg, offering an unobstructed view of the Uhrturm. Today, the main square serves as a stage for urban festivals, Christmas markets, carnival parades, and New Year's celebrations, remaining a meeting point.