Southwark Cathedral

The Cathedral sits tucked between Borough Market and the Thames, which means you'll stumble across it almost by accident if you're wandering south of the river. Once you're inside, the soaring Gothic nave stops you dead - it's genuinely impressive, with medieval stonework and stained glass that catches the light properly. The choir stalls are where it gets interesting for history types: Shakespeare's brother is buried here, and you can see the actual tomb stones if you know where to look.

It's free to wander around, though they do ask for a donation - reasonable enough for what you're getting. Allow a solid hour if you want to read the plaques and actually absorb the place, or twenty minutes if you're just cutting through from Borough to the bridge. The vaulted ceilings are high enough that kids tend to crane their necks and go quiet, which some parents will call a win.

For a park holiday based at Lovat Parks nearby, this works as a half-decent afternoon break when the weather turns dodgy. You're already in London for it, so it fits without planning a separate trip. The location means you can combine it with Borough Market, the Shard views, or a proper walk along the South Bank. It won't blow your mind if you've seen cathedrals before, but it's worth the detour for the riverside spot and the Shakespeare connection if that appeals.