The roman style Cathedral Sainte-Eulalie-et-Sainte-Julie was completed in the 11th century. Work began on rebuilding the cathedral in the 14th century but was never finished, which explains the irregular appearance of the main facade - the tower on the right was built at this time but not the tower on the left, so a much smaller tower was added later instead. The cathedral is notable for the lack of decorative stonework on the outside.

The cloisters were also built over the course of three hundred years, which explains why some parts are more ornamented than others - despite this the cloisters are very beautiful, with marble arches featuring interesting capital stones surrounding a nicely maintained garden. The cloisters now also contain a Museum of History and a Museum of Archaeology.