Free things to do in Europe 2

2) London's Changing of the Guard

The Queen's Guard in London changes in the Forecourt inside the gates of Buckingham Palace at 11.30 a.m. every day during the summer months and on alternating days in the winter. Although it's free to view, you might want to invest some time to get there early enough for a good vantage point. This might be Europe's most popular free attraction, and the crowds can be huge.

http://golondon.about.com/od/thingstodoinlondon/tp/free_London.htm