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 Cathedral of Saint Mary Major, often called Lisbon Cathedral or simply the Sé, is a Roman Catholic cathedral located in Lisbon, Portugal. The oldest church in the city, it is the seat of the Patriarchate of Lisbon. The cathedral has survived many earthquakes and has been modified, renovated and restored several times. It is nowadays a mix of different architectural styles.
The site where it stands was the principal mosque of Lisbon when it was an Arab settlement. The construction of the cathedral started around 1150, three years after the city was conquered from the Moors during the Second Crusade. Shortly after the victory the English knight Gilbert of Hastings was named bishop of the city of Lisbon.
One good reason to visit the Cathedral is to visit its charming cloisters located in the back. There are several tombs in the cathedral, the most notable of which is the beautifully sculpted tomb of Lopo Fernandes Pacheco and his wife.