Saint George's Castle (Castelo de Sao Jorge), Lisbon, Portugal, Europe

lisbon portugal historic site medieval architecture ancient fortifications visitors tourism landscape clear sky picturesque cultural heritage european landmark exploration fortress historical significance scenic view travel destination nature stone walls bridge panoramic views city skyline historical architecture ancient ruins outdoor exploration historical site cultural experience sightseeing lush greenery castle grounds landmarks tourist attraction day trip historic monument travel architecture unesco ancient history romantic getaway local culture heritage site travel guides visitor experience beautiful vistas history enthusiasts saint