In the northern part of the village, the ruins of the Byzantine Tower stand out, dominating the hill with a panoramic view of the entire settlement and far to the peaks of Parnon with its chestnut forests, fir trees, pine trees and even further to the Argolic Gulf. The Tower, according to historical sources, was built by the Byzantines in the 14th century and was an important fortification for controlling the important road that started from Argolis and ended in the Laconian plain.
In Kapsampeli Square, above the old Elementary School building, there is the Patron Church of the Transfiguration of the Savior. This Church was built in 1780 after a special permission from the then Turkish Aga of Tripoli who had visited Kastanitsa and was completely pleased with the hospitality of the residents and their beautiful gifts.
In Agios Giannis Square and in the building that until 1992 housed the Primary School, from 1870, the Kastanitsa Information Center was established in 2008 with funding from special European Programs.
Through the special architectural beauty of Kastanitsa, the Tower Houses emerge, all of which carry a history of several centuries. Scattered throughout all the neighborhoods of the village, but mainly in the neighborhood of Pyrgos, they stand out with their imposing volume.
Five hundred meters from the settlement and on the Kastanitsa-Sitainas provincial road, in 2006 a very picturesque space was formed and recreated with paved streets, traditional lanterns, flowers, plane trees and all this in a lush green environment full of chestnut trees, walnut trees and several bodies of water.
Both in the village and around it there are at least ten churches and chapels, excellently preserved thanks to donations from the Associations and all the people of Kastanitsio. It is worth mentioning the churches of Agios Nikolaos in the neighborhood of Pyrgos and Ioannis Chrysostomos in Agianni Square, Agios Georgios higher than the village, where a passable marked path leads, etc.
Outside the village, three watermills operated that ground wheat. From agreements of 1828 it appears that watermills were operating in Kastanitsa since then. Today, the ruins of the last watermill that operated until approximately 1970 are preserved.
