Sidirokastro is 18 km far from Greek-Bulgarian boundaries and 100 km from the city of Thessaloniki. The imposing rock with the Byzantine castle in the center, the natural beauty and the hospitality of the local people are the main features of the town. It has idealy been situated for daily trips to Kerkini Lake, to the strong point Roupel, to the town of Serres, to the skiing snow center, Lailia and to the famous Alistratis Caves together with several monasteries and other historical sites.

Sidirokastro's history reaches a long way back in time. There are Palaeolithic ruins here, and references to the area are found in Homer and Herodotus. Its ancient inhabitants migrated to Sidirokastro from the island of Limnos. The area's first inhabitants were of the Sintian tribe, after which Sintiki Province is named. Sintiki is one of the provinces of the Serres Prefecture, of which Sidirokastro is the capital. A landmark in the area's history is the 1014 AD decisive battle in the course of the Byzantine-Bulgarian Wars that took place at Sintiki's Roupel (battle of Kleidion), to the north-west of Sidirokastro. The Byzantine army led by Emperor Basil II defeated the Bulgarians under the command of Emperor Samuil. Basil II blinded 14,000 Bulgarian soldiers after the battle and sent them back to Bulgaria. After this atrocious act, Basil II and went down in history as Voulgaroktonos, the "Bulgar Slayer".On September 20, 1383, Sidirokastro was overtaken by Ottoman forces and remained under their rule for 529 years. Its name was changed to "Demir Issar". In 1912, Sidirokastro was captured by the Bulgarians under general Georgi Todorov. The Greek army took Sidirokastro on September 21, 1918. In April 1941, after the surrender of the Roupel stronghold and the German army's invasion of Greece, the Bulgarian army recaptured Sidirokastro. The Bulgarians left in 1944 and Sidirokastro's control returned to Greece.

Sidirokastro's population is a blend of indigenous people and descendants of the early 20th century waves of refugees from Asia Minor (people who sought asylum in Greece from the wars and conflicts of that period). Sidirokastro took in refugees from Melnik in 1913; from East Thrace (European Turkey) after the 1922 onslaught that followed the Greco-Turkish Wars in Asia Minor; from Pontus, Vlachs and people from all over Greece. The town's greatest annual festival is on 27 June, celebrating the area's liberation from Ottoman rule in 1913. It is an anniversary the locals celebrate with reverence, emotion and pride.

The town is divided into two sections, which are connected by picturesque bridges. The oldest and most romantic of these are Stavros and Kalkanis. The landscape is made even prettier thanks to the Maimouda rivulet and its miniature bridges.

The Sidirokastro Hot Springs have a temperature of 45°. They are just outside the town to the north, near the Strymonas River railway-bridge, on a hill that offers panoramic views of the area. Thousands of people go to these hot springs every year, both for recreation or therapy, especially since the recent renovation of the area's tourist facilities. There are more hot springs in Thermes and in Angistro

There are quite interesting sights to be found in Sidirokastro, such as the ruins of the Byzantine castle, the Agios Dimitrios church that is carved in rock, and the quaint bridges over the Krousovitis River.

The Issari Fort, built by Emperor Basil II. Standing 155 metres tall, it towers over the town's northwest side. The town owes its name to this fort: "Sidirokastro" means "iron castle" in Greek, as does "Demir Issar" in Turkish.

Caves in Sidirokastro