The Frankish Castle of Chlemoutsi is located 4 Km far from Olympia Golden Beachi and it was built in a height of 235 meters, from the "Achaia prince" Godefrid B' Villehardouine of Morea, in 1217 A.C. The guards were watching the Elian plain and the Ionian see from the towers of the fortress. Up from the fortress one can enjoy a spectacular view. The sights that are viewable from this height are the islands Zakinthos (Zante) & Kefallonia, the estuary of the river Pineios and the illimitable Elian plain.

The castle consists of two enclosures. The inner enclosure, which included the residence of the castellan or the Prince and the outer enclosure which consisted of the chapel and the residence for the garrison. The inner enclosure is built on the highest point of the hill and it has the shape of an irregular hexagon made up of a continuous row of halls around a vast central courtyard. In the outer enclosure, extending north and west, remains of buildings, cisterns and a Turkish mosque exist. In the buildings of both enclosures remains of numerous fireplaces exist. The western architectural features are predominant in the castle, like the depressed or slightly pointed arches chosen for the openings and the ovoid vaults which cover the halls of the inner enclosure.