This monastery is famous as the place Vincent van Gogh sought refuge from May 1889 to May 1890, but it is also a genuine masterpiece of Provençal Romanesque architecture in its own right. Its name derives from its proximity to the Roman Mausoleum of the Julii. The Romanesque elegance of its 11th- and 12th-century cloisters recalls the church of Saint Trophime in Arles, and the chapel they back onto is pure Romanesque – apart from its 18th-century façade – with its square bell tower in the traditional Lombard style. The Franciscan monks of the Observantine mendicant order were the first to care for people with psychiatric illnesses here, as far back as the 15th century. This beautiful place exudes a powerful serenity, even today, and is still in use as a therapeutic psychiatric institution where visitors are asked not to disturb the atmosphere of tranquillity.