Sofia is the capital and largest city of Bulgaria, located in the western part of the country. It sits at the foot of Vitosha Mountain and has a rich history that dates back over 2,000 years. The city is known for its diverse architecture, which includes Roman ruins, Byzantine churches, and modern buildings. The population of Sofia is approximately 1.2 million people, making it a vibrant cultural and economic center. Key landmarks include the Alexander Nevsky Cathedral, the National Palace of Culture, and the Serdica archaeological complex. Sofia also serves as an important hub for education and transportation in the region.