Serres is a city in Macedonia, Greece. Delve into the past of the city at the Archeological Museum of Serres. The Museum is housed in an Ottoman-era building and has exhibits from the Roman, Classical, and Byzantine periods amongst others. Visit Alistrati Cave, one of the largest in Europe. The cave dates back to two million years ago and features a variety of stalagmites and stalactites. Visit the lion of Amphipolis, an iconic monument that dates back to the 4th century. Have a picnic at Lake Kerkini, an artificial reservoir situated 40 kilometers from Serres town. The location of Lake Kerkini makes it one of the best places in Europe for bird watching. Tour the Mehmet Bey Mosque to understand the grandiosity of Ottoman architecture. The 15th-century mosque boasts a beautiful garden as well.