Church of Saints Constantine and Helena

The Roman theatre of Philippopolis (Latin: Theatrum Trimontense; Bulgarian: Пловдивски античен театър, Plovdivski antichen teatar) is one of the world's best-preserved ancient Roman theatres, located in the city center of modern Plovdiv, Bulgaria, once the ancient city of Philippopolis. It was constructed in the 1st century AD, probably during the reign of Domitian.

The old town in Plovdiv is an architectural and historical reserve located on three of Plovdiv's hills: Nebet Tepe, Dzhambaz Tepe and Taksim Tepe. The complex has been formed as a result of the long sequence of habitation from prehistoric times to present day and combines the culture and architecture from Antiquity, Middle Ages and Bulgarian revival.

Hisar Kapia (from Turkish: Hisar Kapı meaning "Castle Gate") is a medieval gate in Plovdiv's old town and one of the most famous tourist sights in the city. The gate was built in the 11th century AD over the foundations of a gate from Roman times (probably from the 2nd century AD).

The Stadium of Philippopolis was the ancient Roman stadium of Philippopolis (modern Plovdiv), built in the 2nd century AD, during the Roman imperial period. It is among the largest and best preserved buildings from the time of the Roman Empire in the Balkan peninsula.