As famous for its reputed hunchback as it is for it's stunning architecture the Notre Dame Cathedral is incredible in its grandeur and its truly spectacular design. Construction began in the mid-12th century and it took almost 200 years to complete the 'initial' design. However work continued in the ensuing centuries with further elements added for both aesthetic and structural reasons - most notably the amazing flying buttresses added to stop the outer walls from collapsing as the building grew in size. Every part of Notre Dame is amazing and it's not until you witness it in person that you can truly grasp its vast dimensions and intricate detail.