hole in the wall

This is a picture taken through the "Hole in the Wall". This hole in the wall cuts the journey time between Imperial College and Harrods down to about 10 minutes (walking). If it wasn't there would - guess what - only be a wall and no hole. Therefore the hole was a very useful idea. The above mentioned walk is, by the way, also very scenic (in terms of the living rooms you can have a look at) and highly recommended.