The must-see attractions in Füssen include the iconic Neuschwanstein Castle, reminiscent of a storybook palace, and the neighboring Hohenschwangau Castle, both offering insights into Bavarian royalty. The cozy streets of the historic old town, Alstadt, reveal a tapestry of Gothic architecture, while the tranquil Lake Alpsee provides a natural escape with stunning views. The impressive Highline179 suspension bridge offers a different perspective on the area's beauty.