Why didn’t I know about the Tarn Valley? I’d often been right next door. But here, north-east of Toulouse, between the baking fields of Gers and the rocky mountains around Carcassonne, is this best-kept secret. It’s a lush region of great rivers, rolling green hills and towns with magnificent red-brick gothic architecture and is sometimes referred to as the Triangle d’Or (mostly by estate agents). The sea is three hours away in either direction, which is a boon, meaning that even in August it was eerily devoid of tourists.
If the points on the triangle are the towns of Gaillac, Albi and Cordes sur Ciel, in between are any number of really beautiful bastide villages. We were staying near Gaillac, which is pretty low-key, a proper working town best known for its local wines — it has its own appellation. There’s no major draw for sightseers but it is very attractive. The first thing you see as you drive in over the bridge is the 13th-century church of St Michel, a soaring pink edifice of Romanesque brick. There was an abbey here, which is now a maison des vins and tourist office, and the old streets behind the church are ancient and winding, lined by overhanging houses with timber beam and herringbone brick facades. There is a cobbled colonnaded square with a fountain. And skirting the town like an immense moat is the Tarn, edged by densely wooded banks and crisscrossed by dragonflies.
Follow the river and you get to Albi, which people know about because of its extraordinary cathedral, built in the 13th century to put the stamp of Catholicism on the city following the Albigensian crusade against the Cathars. It is ridiculously imposing, built entirely of hot red brick, set in a vast square and flanked by the equally formidable Berbie Palace.

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