Big Ben from Parliament Square
Big Ben is the name given to the main clock in the tower of the Palace of Westminster.
The Palce of Westminster is the home of the British Parliament. It's located along the river Thames.
On the image below you can see Big Ben and to the left of it in the background the London Eye.
From the London Eye you have a great view the Houses of Parliament and Big Ben
Other famous tourist attractions in London are Tower
and the Tower of London