The Temple of Zeus is the reason most travellers come to Çavdarhisar. Its raised platform, surviving columns, and deep substructure make it one of the most impressive Roman temple remains in Turkey, especially because it stands in open village air rather than inside a heavily managed tourist zone.
Walk around the base before going up to the columns. The building's scale is clearest from below, where you can see how the temple dominates the old city and why Aizanoi mattered in Roman Phrygia.