Globe Theatre, London

I know it's only a reproduction but the new Globe Theatre is still a must on your walk down the South side of the Thames. With this zoom level, you can see the audience at a performance.

Here's their web site.

This is a really interesting part of town. The Tate Modern is just to the West and the Millennium Bridge crosses the Thames slightly to the West. I seem to recall that there are a few pubs nearby also.