You don't need to know anything about engineering or building to appreciate a structure like Pont Saint-Louis. Stand back and take in the workmanship and creativity on display.
This modern structure is located in the famous neighborhood of Notre Dame. Pont Saint-Louis is free to explore, making it the perfect cheap day out. Set aside enough time to explore a few nearby attractions, such as Eiffel Tower, Louvre Museum and Arc de Triomphe.