Île de la Cité is a small, historic island in the Seine River at the heart of Paris, often regarded as the city's birthplace. It is home to some of France's most iconic landmarks, including Notre-Dame Cathedral, the stunning Sainte-Chapelle, and the former royal palace turned prison, the Conciergerie. Connected to the rest of Paris by 9 bridges, including the Pont Neuf, the island blends monumental architecture, serene green spaces like Square du Vert-Galant, and centuries of history, making it a must-visit destination for any traveler.