One of the Gallura area’s most characteristic Nuragic landmarks is a sacred well where water worship rituals were performed. Pozzo Sacro di Sa Testa (The Holy Well of Sa Testa). It dates to between 15th and 13th centuries BCE and sits just outside of the town of Olbia. It is just under 18 metres long and made of granite, trachyte and schist cut into blocks that were then carefully finished. The external part is reminiscent of a door and symbolizes the gateway that separates the world of the dead from that of the living. The shrine has a circular courtyard, a vestibule, a small hallway between the courtyard and the well, and steps that lead down to the water at the bottom.References:
The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.