Tower Bridge is famous because it's London's most striking bridge thanks to its Neo-Gothic architecture & lifting central sections. When it opened, it was the most sophisticated bascule bridge in the world. You can now build your own Tower Bridge with Nanoblock. Containing 1700 pieces, level 5 difficulty. Each Nanoblock set comes with spare blocks & detailed step-by-step building instructions. Each set is marked with a difficulty rating level from 1-5. Start of at a beginner rating of 1 & work your way up to a challenging level 5.