A trespasser stands and walks along the roof at House of Commons early Sunday morning in London. The unidentified man was taken into custody after spending about eight hours wandering around the roof of the Palace of Westminster. Keith Hewitt/Getty Images hide caption

itoggle caption Keith Hewitt/Getty Images

When Parliament is in session, some may be overdoing it. Dan Kitwood/Getty Images hide caption

itoggle caption Dan Kitwood/Getty Images

President Obama, accompanied by Commons Speaker John Bercow and Lords Speaker Baroness Helen Hayman, as he entered Westminster Hall. Nicholas Kamm /AFP/Getty Images hide caption

itoggle caption Nicholas Kamm /AFP/Getty Images