The Temple of Concordia in Agrigento

The Temple of Concordia, located in the Valley of the Temples in Agrigento, Italy, was built around 440-430 BC. It is one of the best-preserved Greek temples, particularly of the Doric order. The structure features a well-preserved peristasis of six by thirteen columns standing on a crepidoma of four steps. The cella measures 28.36 m × 9.4 m, and the columns are 6 m tall and carved with twenty flutes and harmonious entasis.

The temple was constructed on a solid base designed to overcome the unevenness of the rocky terrain, similar to the nearby Temple of Juno. It has been conventionally named after Concordia, the Roman goddess of harmony, due to a Roman-era Latin inscription found nearby which is unrelated to the building.

In the 6th century, the temple was converted into a Christian basilica dedicated to the apostles Peter and Paul by San Gregorio delle Rape, which helped it survive the destruction of pagan places of worship. The spaces between the columns were filled with walling, altering its Classical Greek form. These Christian refurbishments were removed during a restoration in 1785, and the Prince of Torremuzza began further restoration of the classic building in 1788.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons