camps. On 30 October 1944, after battles with the retreating German army and the Security Battalions of Poulos, forces of ELAS entered Thessaloniki as liberators headed by Markos Vafiadis (who did not obey orders from ELAS leadership in Athens to not enter the city). Pro-EAM celebrations and demonstrations followed in the city. In the 1946 monarchy referendum, the majority of the locals voted in favor of a republic, contrary to the rest of Greece. After the war, Thessaloniki was rebuilt with large-scale development of new infrastructure and industry throughout the 1950s, 1960s and 1970s. Many of its architectural treasures still remain, adding value to the city as a tourist destination, while several early Christian and Byzantine monuments of Thessaloniki were added to the UNESCO World Heritage list in 1988. In 1997, Thessaloniki was celebrated as the European Capital of Culture, sponsoring events across the city and the region. Agency established to oversee the cultural activities of that year 1997 was still in existence by 2010. In 2004, the city hosted a number of the football events as part of the 2004 Summer Olympics. Today, Thessaloniki has become one of the most important trade and business hubs in Southeastern Europe, with its port, the Port of Thessaloniki being one of the largest in the Aegean and facilitating trade throughout the Balkan hinterland. On 26 October 2012 the city celebrated its centennial since its incorporation into Greece. The city also forms one of the largest student centes in Southeastern Europe, is host to the largest student population in Greece and was the European Youth Capital in 2014. Geography Thessaloniki is located 502 kilometres (312 mi) north of Athens. Thessaloniki's urban area spreads over 30 kilometres (19 mi) from Oraiokastro in the north to Thermi in the south in the direction of Chalkidiki. Geology Thessaloniki lies on the northern fringe of the Thermaic Gulf on its eastern coast and is bound by Mount Chortiatis on its southeast. Its proximity to imposing mountain ranges, hills and fault lines, especially towards its southeast have historically made the city prone to geological changes. Since medieval times, Thessaloniki has been hit by strong earthquakes, notably in 1759, 1902, 1978 and 1995. On 19–20 June 1978, the city suffered a series of powerful earthquakes, registering 5.5 and 6.5 on the Richter scale. The tremors caused considerable damage to a number of buildings and ancient monuments, but the city