Looking at the incredible church of Saint-Séverin, you can see all the main architectural styles from the 1200s to the 1600s, including the 19th-century 'stylistic' restorations. This church has it all: a Baroque vault, an early-Gothic side portal, a fifteenth-century bell tower, and above all, an enchanting, bright, and peaceful Gothic interior. On the back walls the style becomes the so-called "flamboyant Gothic" from the late-15th century, which will leave you speechless with its virtuoso twist of branched vaults and the splendid pillar formed by a group of spiraling columns.