1. Historic Castle: Heidelberg is home to the Heidelberg Castle, a stunning ruin that overlooks the city and is one of the most important Renaissance structures in Germany. The castle has a rich history dating back to the 13th century and offers breathtaking views of the Neckar River and the surrounding landscape. 2. Philosopher's Walk: The city features a famous path known as the Philosopher's Walk (Philosophenweg), which offers scenic views of Heidelberg and is named after the philosophers who used to stroll there for inspiration. The path is lined with beautiful gardens and provides a peaceful retreat from the bustling city. 3. Old Bridge: The Alte Brücke (Old Bridge) is one of Heidelberg's most iconic landmarks. Built in the 18th century, this charming stone bridge features a unique gate, statues, and a beautiful view of the city and castle. It is a popular spot for both locals and tourists, especially during sunset.