The Church of St. Francis contains a chapel that's probably unlike any you've seen: The chancel walls and central pillars of the ghoulish 16th-century Capela dos Ossos (Chapel of Bones) are lined with human skulls and other parts of skeletons. Legend has it that the bones came either from soldiers who died in a big battle or from plague victims. Over the door is a sign that addresses visitors' own mortality: OUR BONES THAT STAY HERE ARE WAITING FOR YOURS! The church was built in the Gothic style with Manueline influences between 1460 and 1510.