A full-day trip from Sofia to the UNESCO-listed Rila Monastery, Bulgaria’s most important Orthodox monastery, set dramatically in the forested Rila Mountains and famous for its colourful frescoes and striped arcades. The tour usually pairs it with the small Boyana Church near Sofia, whose 13th-century murals are a national treasure. Transport and a guide are included, making it the easiest way to see two of the country’s cultural highlights in a day.