The Basilica of San Simplicio, in Olbia, is the most important and ancient religious monument in northeastern Sardinia and a testimony to the spread of Christianity on the island. Cathedral until 1839, parish church since 1955, it was given the title of minor basilica, in 1993, by Pope John Paul II. It is dedicated to St. Simplicio, protobishop of the city and martyr under Emperor Diocletian.

One of the most characteristic monuments of the Nuragic civilization in Gallura, in the northeastern part of Sardinia: a sacred well where the rituals of the cult of water were held

The aqueduct of Olbia was built by the Romans between the 1st and 2nd centuries AD. C., to collect water from the springs of Mount Cabu Abas. Next to the aqueduct, a large settling tank was built, carved completely into the stone and equipped with six holes for ventilation. On the sides of the cistern there are two other smaller tanks and a water inlet and outlet well. On the arches you can still see the water transport channels. It is the best preserved archaeological site of the Roman age in Sardinia.

Near Olbia and the northeastern coast of Sardinia, stands a prehistoric monument of over 4,000 years ago, which evokes the head of a bull, a nuragic deity

The Castle stands on a fortress of 89 meters and characterizes the entire southern part of the Olbian basin. Its origin dates back to 1296 and 1322, during the period of Pisan-Aragonese domination during the rise of the Visconti family.

Necropolis located under the Basilica of San Simplicio

Archaeological Museum

The main street of the historic city centre

Fausto Noce Park is the green lung of the city. With eighteen hectares of greenery, in 2005 it was named as the second best green project in Italy.