Where does the Changing of the Guard take place?

Ottawa Parliament Hill.
Every summer morning at 10:00am, the Changing of the Guard takes place on Parliament Hill. It's a pageantry of marching music and military drills, performed by the Governor General's Foot Guards. In 2006, the ceremony runs from June 24 to August 26, weather permitting. Arrive early for the best spot on the grass of Parliament Hill. Admission is free.
http://ottawastart.com/changingoftheguard.php - 16k
A similar ceremony caled the "Relief of the Sentires as Guards" takes place daily at Rideau Hall, the residence of the Governer General. Guards march to their posts in front of the residence, accompanied by a bagpiper. For 2006, the ceremony takes place from June 24 to August 27, every hour from 9am

London BUCKINGHAM PALACE
11.00am Changing the Queen’s Life Guard at Horse Guards Parade
The mounted Regiments change The Queen’s Life Guard at the entrance to Horse Guards, daily at 11.00am (10.00am on Sundays only). There are two types of Queen’s Life Guard. A Long Guard consisting of 17 men is mounted when The Queen is resident in London, otherwise a Short Guard made up of 12 men is mounted.

11.00am The Changing the Guard at Windsor Castle Very similar to The Changing the Guard at Buckingham Palace, the Battalion of Foot Guards stationed at Windsor provide the daily Guard. For further information please call 09064 123411.

4.00pm The 4 o’clock Parade Horse Guards is the official entrance to Buckingham Palace, therefore The Queen’s Life Guard is mounted here and is inspected daily at 4 o’clock.
http://www.changing-the-guard.com/sched.htm - 24k