The first castle in Xaintrailles is mentioned in 1259 as being held by three co-lords, all from the Xaintrailles family. It was built in the early 13th century, and what remains are the medieval outer courtyard, the keep, and the embankments of the south and west walls.
Jean Poton de Xaintrailles, a companion of Joan of Arc who died in 1461, followed by his successors Bernard de Lamothe and Antoine de Chamborel, governors of Casteljaloux, undertook constructions in the 15th century: two towers and the north residential wing. In the 16th century, turrets with fan-shaped projections were added to the south elevation, and moats and a drawbridge are mentioned in 1539. In 1570, the castle passed to the Montesquiou family, and later through marriage to the Lau de Lusignan family in 1724.
Around 1780, Armand de Lau, Marquis de Lusignan, had the moats filled in and an access arranged from the west. In 1824, the northeast rooms collapsed, and in 1843, the keep was partially restored based on the project of Gustave Bourières, the department's architect.
The oldest part of the castle is the 13th-century keep, with windows added in the 15th century. The north residential wing from the 15th century has one square floor and two attic floors with a hipped roof covered with flat tiles. Like the keep, it has an out-of-service staircase. The one-story and attic south building with turrets was renovated (kitchens). The west wing is flanked by two towers.
The U-shaped staircase and vestibule were added in the 18th century.
The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.