Pena Palace, hilltop castle surrounded by lush forest in Sintra, Lisbon, Portugal

pena palace sintra palacio da pena aerial view unesco world heritage site palace portugal castle palacio world heritage site fortress lisbon panorama aerial unesco hilltop moorish wide shot medieval landmark national monument famous place tourism on top of landmarks romanesque middle ages mountain scenic picturesque landscape architecture hill travel green destinations red no people nature horizontal romanticist idyllic outdoors eclectic gothic journey yellow forest tree