Lisbon’s tallest hill was fortified even before the Roman occupation. The Visigoths and the Moors all left their mark. The castle you see today is the restored version of the Moorish construction, which largely collapsed in the 1755 earthquake. It was also the royal residence, before the king decided to build a palace on the waterfront, which was also completely destroyed in the earthquake. Today the castle crowns the city as the main landmark of ancient Lisbon, and offers a breathtaking view from its walls and pine-shaded terraces.
Later, the castle was named after Saint George, the patron saint of England, following the Anglo-Portuguese Treaty in 1373. A series of cannons pointing down at the city is a reminder of the original purpose of the site.
If you want to visit the castle, please hop off at the stop called Largo portas do Sol. The castle is 3-4 minutes away from here.