Gargoyles, Notre Dame de Paris.
These aren’t all as old as they look, the gargoyles are part of Viollet-le-Duc’s 19th century restoration of Notre Dame, but the sepia tone makes them seem complementary. There’s a lot more at the Andrew White Architectural Photographs Collection at Luna Commons.
Wrought iron torch holder or horse tether from the Strozzi Palace by Benedetto da Maiano.
Flying buttresses, Reims Cathedral.