Bulgarias capital, the city of Sofia, is the biggest settlement in the country. Sofia is located in the western part of Bulgaria, in the vicinities of the picturesque Vitosha Mountain. The location makes climate in Sofia slightly harsher than in the rest of the country. Summer heat is moderately intense but winters usually turn to be cold and snowy. Sofia has rich history dating back in time. The settlement appeared in the 7th century BC. Thracians founded the town close to mineral springs. They named the town Serdika. Once it became part of the Roman empire, many soldiers settled there and the city started changing its appearance. Following the Roman style it got a new fortress wall, the streets were paved, Serdika got a sewerage system, which provided residents with clean water from the nearby mountain. In the end of the 3rd century BC, Serdika became a main city of a Roman province. It got even more municipal buildings and a villa zone.