The Imperial State Crown (1937) is worn by the Queen at each State Opening of Parliament. One of the youngest crowns in the collection, it holds a number of much older gems. The crown was remade in 1937 after the previous frame weakened under the weight of the gemstones.
The entrance to the Tower Subway - the first 'tube' line in the world. It ran under the Thames but was only open for a few months. This is its north side of the river entrance on Tower Hill, rebuilt after closure. According to Mark Brader, the equivalent south side entrance "...fell to redevelopment" in the 1990s.
20 Amazing Architecture Landmarks Around The World