Tower Bridge is a must-do that you can enjoy from a distance and right up close. Check the website in advance and visit when there’s a planned ‘bridge lift’ (that’s when the two halves of the road lift up so that bigger boats can pass below). There are lots of tours so you can see the engine rooms, hear about its history or join a Tots at Tower Bridge family storytelling session. But, don’t miss the glass-floored walkway that now spans the bridge’s towers, 42 metres above the Thames. It’s really a breath-taking experience.