St. Paul’s Cathedral is a must see while you are in London. So much history has happened in this building that it feels as if it almost oozes from the walls. The Cathedral is breathtakingly gorgeous. You can sit and observe a service or climb to the top of the iconic dome. While you are at St. Paul’s be sure to check out the crypt and take a tea break in the tea room in the basement. While visitors are welcome please do keep in mind that the Cathedral is a functioning church.