Self-Guided Walking Tours to Explore Sintra, Portugal
How it works: Download the app "GPSmyCity: Walks in 1K+ Cities" from iTunes App Store or Google Play Store to your mobile phone or tablet. Each walk comes with a detailed tour map as well as photos and background information for the featured attractions. The app's navigation functions guide you from one attraction to the next. The app works offline, so no data plan is needed when traveling abroad.