The ruins of Nicopolis, now known as Palaea Preveza ("Old Preveza"), lie about 5 km north of the town, on a small bay of the Gulf of Arta (Sinus Ambracius) at the narrowest part of the isthmus of the peninsula which separates the Gulf from the Ionian Sea. Besides the Acropolis, the most conspicuous features are:
The Actium monument of Augustus, a theatre ( with 77 rows of seats), an Odeon, large sections of the original walls, an aqueduct which brought water to the town from the Louros river over a distance of about 50 km. The aqueduct bridge over the river downstream from the source is one of the very few remaining in Greece today. The water was finally brought to the Nymphaeum in the city which also contained a header tank from where it was further distributed. Remains of the aqueduct in several forms of construction are visible in the regions of Thesprotiko, Louros, Stefani-Oropos, Archangelos and Nicopolis. Recent research has assigned its construction to Hadrian’s rule, in the 2nd century AD. Ancient sources mention that in the 4th C AD the aqueduct needed several repairs which were undertaken by Emperor Julian. The Aqueduct ceased to operate in the mid 5th century. The nympheum or great fountaiS, the baths (thermae), the Roman villa of Antoninus with beautiful mosaic, the stadium, was the location of the famous Actian Games, together with the nearby gymnasium, theatre and hippodrome. It was located in the so-called 'Proasteion' (sacred grove) of Nikopolis. Dating from just after the city's foundation, the stadium has two semicircular ends (sphendones), typical of the Roman amphitheatre type. The stadiums of ancient Laodicea (near Pamukkale, Turkey) and Aphrodisias (Geyre, Turkey) have a similar architecture. The north side of the stadium, which must have held a capacity of at least 10,000 spectators, was built on the side of a hill, while artificial deposits were used for the other sides. The walls were made of a rubble core faced with several courses of bricks. On the west side of the stadium were three apsidal entrances leading to the gymnasium, the central one larger than the others. The entrances in the sphendone at the east led to the theatre nearby. On the sphendone at the south side there were residential rooms and facilities for athletes and spectators (inns, shops, lodgings etc.)
The nearby Archaeological Museum of Nikopolis contains many exhibits.