Try to save Sainte-Chapelle for a sunny day, when Paris’ oldest, finest stained glass is at its dazzling best. Enshrined within the Palais de Justice (Law Courts), this gem-like Holy Chapel is Paris’ most exquisite Gothic monument. It was completed in 1248, just six years after the first stone was laid, and was conceived by Louis IX to house his personal collection of holy relics, including the famous Holy Crown (eventually moved to Notre Dame).
Free 45-minute guided tours in English depart daily between 11am and 3pm. Audioguides (30 minutes) cost €3, or download the Sainte-Chapelle Windows smartphone app to explore all 1113 windows in luxuriant, intricate detail.