The imposing Sé de Lisboa is one of Lisbon's most iconic buildings, dating back to 1150 when Christians reclaimed the city from the Moors and quickly erected a fortress-like structure on the site of a mosque. It was lovingly restored in the 1930s and, despite the throngs of admiring tourists outside, the rib-vaulted interior remains peaceful and is illuminated by a beautiful rose window. Take a stroll around the cathedral and you'll even spot some mischievous gargoyles peering down from the orange trees.