You'll find a range of historical architectural influences in the Carpentras, from Romanesque, Gothic, classical, renaissance and baroque. The impressive Hotel Dieu was built in the 18th century for the Bishop of Carpentras and holds an impressive collection of art donated by wealthy patrons of the time. It has become a cultural centre and you can take tours, visiting the pharmacy, a baroque chapel, polentiful marble decorations and library.
Other museums in Carpentras include Musée Sobirats (decorative arts) and Musée Comtadin - Duplessis (collection of art and local artefacts).
The Cathédrale Saint Siffrein is Gothic in style and dates back to the 15th century. The interior is as lavish as you may expect from a Papal seat with valuable paintings, stained glass from the 15th century, gilded wood carvings and wonderful iron work. The Palais de Justice sits on the same main square and dates from the 17th century.
A Roman arch can be found on the north side of the Cathedral and depicts two prisoners to commemorate Rome's victory over the barbarians. The 14th century Synagogue is the oldest in France and is still active. Its rather plain façade hides a decadent interior. Ancient city walls from that time are mostly gone, although you will find a tower - La Porte d'Orange - to the north of the old town.
Thanks to it's Papal connection and the wealth it created, Carpentras has a plentiful water supply brought from rivers to the north east via aqueducts. The aqueduct that exists today was built in the 18th century and consists of 48 arches with a height of 23m. This water carrying system also allowed for beautiful fountains and wash basins in Carpentras.