An absolute must-see, in the center of Paris: the Square du Vert-Galant is a park named in honour of Henry IV, nicknamed the “Green Gallant”, located Ile de la Cité, 1st arrondissement.

Former royal palace and prison, la Conciergerie is located on the Île de la Cité, in the 4th arrondissement. Antechamber to the guillotine during the French Revolution.
Famous prisoners: Queen Marie Antoinette, the poet André Chénier, Charlotte Corday, Madame Élisabeth, Madame du Barry…
Today, national historical monument, with Marie Antoinette’s cell top attraction.

La Sainte-Chapelle is a Gothic chapel on the Île de la Cité in the heart of Paris. It is perhaps the high point of the full tide of the rayonnante period of Gothic architecture. The most visually beautiful aspects of the chapel, and considered the best of their type in the world, are its stained glass for which the stonework is a delicate framework, and rose windows added to the upper chapel in the fifteenth century.

The 4th arrondissement contains the square of Place des Vosges, the overtly modern Pompidou Centre and the southern lively part of the medieval district of Le Marais, which today is known for being the gay district of Paris (while the northern more quiet part of Le Marais is contained inside the 3rd arrondissement). The eastern parts of the Île de la Cité (including Notre-Dame de Paris) as well as the Île Saint-Louis are also included within the 4th arrondissement.