From December 22 to 29, a festive " Christmas Bus " service will run through the heart of Sofia , offering a free ride to residents and visitors. The service will operate between 3:00 PM and 7:00 PM on these days, with its route starting and ending at the "St. Al. Nevski Square" stop, located next to the National Gallery "Square 500." The bus will stop at 25 other locations around central Sofia , with the entire tour lasting approximately an hour. The route covers key city landmarks, including