We learned so much of Thessaloniki's history in a visual and engaging way. Our tour started at the Church of St. Demetrios, where we went underground into the old Roman baths where the Saint was killed. We learned about the history of the many incarnations of the Church from Roman times onward. From there, we saw Byzantine architecture and symbolism in the Church of Agia Sophia and learned more about the origins of the Iconoclast movement. Another highlight was the Rotunda, which was built by the Pagan emperor Galerius, turned into a Christian church, and then turned into a mosque by the Ottomans. We also visited the Arch and Palace of Galerius, heard the history of the White Tower, and ended by the statue of Alexander. The pace of the tour was excellent for us and packed with new information. By far the best walking tour we took in Greece.