St Paul’s Cathedral
St Paul’s Cathedral is a London landmark and an important place of prayer and worship. Visitors can explore inside, from the underground crypt to the galleries offering views over the Big Smoke.
It's located between several London Underground stops, but St Paul’s Station is just a 2-min walk.
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The only downside was we would of spent longer in the crypt looking at the memorials but as there is also the cafe down there so it seemed rather noisey. Otherwise id definitely recommend visiting.
One final thing is that you cant take photos inside, so a little frustrating but overall better that you dont have people taking grinning selfies in front of war memorials etc