Sintra isn't a natural fairy tale, it's a staged one. Over centuries, kings and millionaires turned this misty mountain into a deliberately romantic landscape of palaces, follies and gardens, from a mansion with a faked seven-fold echo to a hidden Initiation Well and the wildly colourful Pena Palace crowning the peak. This self-guided walking tour traces that layered climb, from the valley town up to the mountaintop. Everything runs from your phone. You get a clear map of all 9 stops, simple directions through Google Maps, and a short audio story with an interactive quiz at each location. The route begins among the neoclassical palaces and the medieval old town, then climbs the Serra to the Moorish Castle and Pena. Most stops are free and best enjoyed from the outside, exactly where the tour takes you. A few, Quinta da Regaleira, the Moorish Castle and Pena, charge their own admission if you want to step inside: this tour is your audio guide and the walk, not the entrance tickets, and Pena in particular should be booked online in advance. One heads-up: the final stretch up to the castle and Pena viewpoints is a steep, roughly 25-minute climb, so wear comfortable shoes and bring water, or hop on the 434 bus. Start anytime, pause whenever you like, and explore freely. No groups, no schedules. Audio and text available in 7 languages. And it comes with a free eSIM, redeemable once per account, so your map, directions and audio work from the moment you arrive, with no roaming charges.