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The Diocese of Aosta (Latin: Dioecesis Augustana, French: Diocèse d'Aoste, Italian: Diocesi di Aosta) is a Latin diocese of the Catholic Church. It has existed in its modern form since 1817. It is a suffragan of the Archdiocese of Turin.

Aosta (UK: , US: , Italian: [aˈɔsta] ; French: Aoste [ɔst],) is the principal city of the Aosta Valley, a bilingual region in the Italian Alps, 110 km (68 mi) north-northwest of Turin. It is situated near the Italian entrance of the Mont Blanc Tunnel, at the confluence of the Buthier and the Dora Baltea, and at the junction of the Great and Little St Bernard Pass routes.

The Leper's Tower is a tower located at the north-west corner of the Roman wall of Aosta, on the rue Jean-Boniface Festaz.

Aosta railway station (Italian: Stazione di Aosta) is the main station serving the city and comune of Aosta, in the autonomous region of Aosta Valley, northwestern Italy. Opened in 1886, it forms part of the Chivasso–Ivrea–Aosta railway, and is also a junction station for a branch line to the nearby Pré-Saint-Didier comune, in the Valdigne, on the way towards Courmayeur. The station is currently managed by Rete Ferroviaria Italiana (RFI). However, the commercial area of the passenger building is managed by Centostazioni. Train services to and from the station are operated by Trenitalia. Each of these companies is a subsidiary of Ferrovie dello Stato (FS), Italy's state-owned rail company.

Émile Chanoux square (French pronunciation: [emil ʃanu], French: Place Émile Chanoux, Italian: Piazza Émile Chanoux) is a city square in Aosta, Italy.

Aosta Cathedral (Italian: Cattedrale di Aosta; Cattedrale di Santa Maria Assunta e San Giovanni Battista; French: Cathédrale d'Aoste; Cathédrale Notre-Dame-de-l'Assomption et Saint-Jean-le-Baptiste) is a Roman Catholic cathedral in Aosta, in north-west Italy, built in the 4th century. It is the episcopal seat of the Diocese of Aosta. In the 11th century the Palaeo-Christian structure was replaced by a new one, dedicated to the Assumption of the Virgin Mary and Saint John the Baptist. The architecture of the cathedral was modified during the 15th and 16th century. The present façade, in Neoclassical style, was built between 1846 and 1848. The structures remaining from the Romanesque period are two clock-towers and the crypt, and also the remaining part of an Ottonian fresco cycle on the church ceiling.

The Roman Theatre is an ancient building in Aosta, north-western Italy. It was built in the late reign of Augustus, some decades after the foundation of the city (25 BC), as testified by the presence of pre-existing structures in the area. There was also an amphitheatre, built during the reign of Claudius, located nearby. It was restored in 2009. Since 2011, the theatre is used for music shows and theatrical performs.

The Collegiate church of Saint Ursus (Italian: Collegiata di Sant'Orso, French: Collégiale de Saint-Ours) is a collegiate church in Aosta, northern Italy, dedicated to Saint Ursus of Aosta. The original church had a single hall, delimited by a semicircular apse. It was entirely rebuilt during the 9th century, during the Carolingian age. Later, bishop Anselm of Aosta further renovated the church, introducing a basilica plan with three naves with wooden trusses. These were replaced by Gothic cross vaults in the 15th century.

The Arch of Augustus (in French Arc d'Auguste) is a monument in the city of Aosta, northern Italy. It was erected in 25 BC on the occasion of the Roman victory over the Salassi and was the work of Aulus Terentius Varro Murena. It is located at the end of the decumanus maximus, a little distance from the Bourg Saint-Ours (quarter of the Collegiate Church of Saint Ursus) and from the eastern entrance of the city wall (the Porta Prætoria).

The Pont de Pierre (French; Italian: Ponte di pietra), meaning "Stone Bridge", is a Roman bridge in the Italian city of Aosta in the Aosta Valley. The bridge crossed the Buthier about 600 m (2,000 ft) from the eastern exit of the Roman colony Augusta Praetoria; in later times the torrente changed its course, leaving the ancient bridge today without water.The single-arch bridge has a span of 17.1 m (56 ft) and a width of 5.9 m (19 ft). The arch vault consists of large voussoirs and shows a comparatively flat profile (span to rise ratio 3:1). The facing was built of pudding stone, the spandrels filled with Roman concrete.The structure is dated to the second half of the reign of Augustus (30 BC–14 AD), who had earlier founded the military colony Augusta Praetoria at an important road junction (24 BC). The Pont de Pierre was of particularly strategic importance, since in Aosta the transalpine routes to Gaul branched off into the Little St Bernard and the Great St Bernard Pass. In southeasterly direction towards the Po Valley, the road led over another segmental arch bridge, the excellently preserved Pont-Saint-Martin Bridge, located at the exit of the Aosta valley.

The Saint-Martin-de-Corléans Megalithic Area (Italian: Area Megalitica di Saint-Martin-de-Corléans, French: Aire mégalithique de Saint-Martin-de-Corléans) is an archaeological site that is considered of major importance for the study and knowledge of European prehistory and protohistory, located in the Saint-Martin-de-Corléans district of Aosta, Italy.

The University of Aosta Valley (Italian: Università della Valle d'Aosta, French: Université de la Vallée d'Aoste, UNIVDA) is a university located in Aosta and Saint-Christophe, Italy. It was founded in 2000.