Every September, hundreds of buildings open their doors to the public for the Open House London festival. From the BT Tower to a tiny north London flat, below are photo galleries of a handful of the architectural delights we visited
One of London's most prestigious and historic hotels
An icon of the London skyline for almost 50 years
From old mail sorting office to award-winning creative hub
A small flat, ingeniously remodelled to maximise every inch of space 17A Mansfield Road
Bethold Lubetkin's 1930s icon of the modernist movement Highpoint
Be inspired to create your perfect home...