The Sainte-Chapelle is the finest royal chapel to be built in France and features a truly exceptional collection of stained-glass windows. It was built in the mid 13th century by Louis IX, at the heart of the royal residence, the Palais de la Cité. It was built to house the relics of the Passion of Christ. Adorned with a unique collection of fifteen glass panels and a large rose window forming a veritable wall of light,the Sainte-Chapelle is a gem of French Gothic architecture. Designated world heritage site by UNESCO. Open:> 1st March to 31st October: Monday to Friday: from 9.30 a.m. to 12.45 a.m. and to 2.15 p.m. to 6 p.m. Saturday and Sunday: from 9.30 a.m. to 6 p.m.> 1st November to 29th February: Monday to Friday: from 9 a.m. to 12.45 a.m. and to 2.15 p.m. to 5 p.m. Saturday and Sunday: from 9 a.m. to 5 p.m. Last admission 30 minutes before closing time. The best time to visit is in the morning from Tuesday to Friday. Closed:> 1st January, 1st May and 25th December and in case of negative temperatures.