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Photo: Benh LIEU SONG, CC BY-SA 3.0 via Wikimedia Commons
Magnificent red-brick building in Neoclassical style, lording it over the pedestrianised main plaza. It houses City Hall (with a grandiose "Salle des Illustres") and the city's main theatre. They no longer do guided tours but you can see much of it free.
The Capitole de Toulouse, commonly known as the Capitole, is the heart of the municipal administration and the city hall of the French city of Toulouse. It was designated a monument historique by the French government in 1840.
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Museum of the history of the city.
Deconsecrated mother-church of the Dominicans (called Jacobins in France because their first convent was in Rue St-Jacques in Paris). Built in Gothic red brick, it contains St Thomas Aquinas' relics. It's now a museum, enclosing the convent, refectory, chapel of St Antonin and Salle Capitulaire.
Fine arts museum set in a former Augustinian monastery surrounding two delightful cloisters.
Musée Saint-Raymond
An archaeological museum with Roman artefacts from around Toulouse as well as the largest collection of Roman busts found in France. The site in ancient times was a necropolis then a hospital for pilgrims on the road to Santiago. The present building is from 1523 and became a museum in 1892.
A red-brick church from the 11–12th century, it may well be the largest Romanesque construction in the world, partly because it was an important stopover on the pilgrimage to Santiago. Huge as it is, it's the only remnant of the former Abbey of Saint-Sernin. Notable features are the great bell-tower, the gates, the "ambulatory" passage, and the thunderous organ. In the 19th century the church was "restored" by the famous French architect Viollet-le-Duc: some of his re-imaginings of the Middle Ages are now being undone. Saint Sernin or Saturnin (d 257) was one of a group sent from Rome to Christianise 3rd century Gaul; he was martyred by being dragged to death by a bull.
Great mansion house built in the 16th century in Renaissance style for a rich merchant. It now houses the personal art collection of Georges Bemberg (1915–2011).