Discover the architectural highlights of Paris: from the oldest known monument in Paris, the Obelisk of Ramses II on the Place de la Concorde, to the 21st-century Bibliothèque François Mitterrand to the stunning Mannerist Renaissance Palace housing the Senate that overlooks the Luxembourg Gardens. Walk through the narrow, winding streets of the Marais, where you'll see the 800-year-old retaining walls that once surrounded the city and splendid 17th-century mansions. Notre Dame Cathedral and the Sainte Chapelle, built for Saint Louis after he acquired the Crown of Thorns, are also on this tour.
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