Visit Notre-Dame Cathedral (exterior view due to ongoing restoration) and Sainte-Chapelle, known for its stunning stained glass. Sainte-Chapelle is open 9:30am-6:00pm; last entry 5:00pm.
Visit these beautiful exhibition halls and museums showcasing art and culture. Petit Palais open 10:00am-6:00pm, free entry for permanent collections; Grand Palais exhibitions vary.