Riniasa Castle protected the medieval city of Riniasa (near Riza village) from a naturally fortified rise, keeping watch over land and sea trade. It is believed to have been built by the Despot of Epirus Thomas I in the late 13th century, and was for this reason called Thomokastro.

Rogi Castle, with its excellently preserved ancient and Byzantine walls, stands atop a low hill (50 m) on the north slope of the Louros valley (ancient Haradros), on the right bank of the river, south of the village of Kerasounta (7 km from Philippiada). In antiquity the river was navigable as far as the castle, so the ancient settlement served as a port on the Ambracian Gulf, fully protected from winds, storms and pirates.

Asprochaliko is a rock shelter in the Louros valley, 20 m above the level of today's riverbed, near Aghios Georgios (Kokkinopilos). Oriented to the south and measuring 22 x 3.5 m, its uniqueness lies in its use during both the Middle and Upper Palaeolithic by nomadic hunters — two of the three phases of the Palaeolithic period.

The name Parga evolved from the city's ancient name (Parageiros, Paragaia, Ypargos). Built by Constantinopolitans, it is mentioned in the 12th century as one of the most important Epirot cities. Finds such as a Neolithic hand-axe, a Mycenean tholos tomb and cist graves testify to human activity in the area since antiquity.

Lekatsa Monastery stands on the west slope of the mountain between Myrsini and Riza, dedicated to the Gennisis tis Theotokou (Birth of the Virgin). According to Seraphim Xenopoulos it was founded in the 8th or 9th century and took its name from its founder or one of its abbots; one tradition holds that the monastery church was built after 1775.

The monastery has recently been restored, and is set within the aesthetic forest of Lekatsa, with many paths for walking that reach down to the sea.

At Pente Pigadia (Five Springs), in the region of Kleisoura, there are two small castles located close to one another. The first was built in the early 19th century with polygonal masonry and is today in ruins.

The second, also built in the early 19th century, is small and likewise of polygonal masonry, but with elements of western European baroque. It survives up to two storeys high and is in better condition than the first.

Near Philippiada — the town of the storks — lies Lake Ziros, an ideal spot for a stop or a walk around the lake through lush green forest. Together with the Ionian Sea, the forests, the Acheron and Louros rivers and the lagoon of the Ambracian Gulf, it forms part of a significant and unique ecosystem.

The Acheron, the mythical river with its unique natural wealth and mysterious atmosphere, can be approached in many ways. At its mouth, at the settlement of Ammoudia, it is navigable for boat trips as far as the Nekromanteion.

In the straits of the Acheron you can walk, swim in the river, go kayaking or horse-riding and explore its paths, on an enchanting riverside route from the Skala of Tzavelaina to the Gates of Hades, near the village of Trikastro. Summer is the most suitable season for the river routes.

The Roman aqueduct of Nikopolis was constructed after the foundation of the city by Octavian (Augustus) (1st century BC - 1st century AD). It consisted of a pipeline 50 km long that carried water from the sources of the River Louros to the two wells of the Nymphaion of Nikopolis.

The walled city of the ancient Molossoi at Orraon was founded in the reign of Alketas (385-370 BC), king of the Molossians, or at the latest in the second quarter of the 4th century BC. It was destroyed by the Romans in 167 BC, rebuilt, and finally abandoned after 31 BC during the enforced colonisation of Nikopolis.