Mentioned by London 2 days itinerary
2 Days in London: The Perfect London Itinerary
"Along the south bank (always worth a wander), you can stop in at Shakespeare’s Globe Theatre, the Tate Modern Art Gallery, and even quickly cross the Millennium bridge for a visit to St. Paul’s Cathedral. The Globe and St. Paul’s Cathedral are both included on the London Pass, whilst the Tate Modern is free to enter."