Roman ruins in Bulgaria can be found in a number of places, including Plovdiv, Veliko Tarnovo, Stara Zagora, Sofia, and more. Many of these sites have been preserved and are open to the public. Some of the most popular sites include the Ancient Roman Theater of Philippopolis in Plovdiv, the Ancient Roman Stadium in Veliko Tarnovo, and the Ancient Roman Forum in Stara Zagora.