Sainte-Chapelle and Conciergerie
Two of Paris's most impressive buildings are located within the medieval Palais de la Cité, home to the Kings of France until the 14th century.
The Sainte-Chapelle is a Gothic-style royal chapel most known for its magnificent stained glass windows, and for housing the Crown of Thorns. The Conciergerie was a royal palace turned prison and its most famous prisoner, Marie-Antoinette, was held in these very walls before she was beheaded at the Place de la Concorde.
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Well worth visiting.