As mentioned in the previous entry, Mussorgsky composed Pictures at an Exhibition after viewing a series of works by his late friend, the architect and painter Viktor Hartmann. HERE is a link to a page that gives you some idea of what Mussorgsky saw. THIS article clarifys the sources of Mussorgsky's inspiration.
Now, we conclude our coverage of Esa-Pekka Salonen conducting the Philharmonia Orchestra at the BBC Proms in August 2006. Here now, "Hut on Fowl's Legs" and "The Great Gate of Kiev"