The key monument to be seen in Loudun is the 11th-century Tour Carrée tower, the remains of a fortress. From the top, 31 metres above ground, there is a beautiful panoramic view over the rooftops and the surrounding countryside. At the foot of the tower lies a charming medieval-inspired garden. The visit of the historic centre of Loudun continues with its numerous white tufa stone residences and mansions. The Sainte-Croix collegiate church is a Romanesque building home to frescoes dating from the 14th century. This building of the 12th century regularly hosts art exhibitions and concerts.
The Théophraste Renaudot museum, housed in the birth house of the inventor of the first printed newspaper in France, is home to old furniture, documents, newspapers, antique printing presses, as well as reconstructions using waxwork figures.
The Charbonneau Lassay museum, located in a 18th-century mansion, exhibits objects, clothes and weapons of Loudun.