The Seven Sisters (Stalinskie Vysotki) are a set of seven famous Moscow skyscrapers built in the Stalinist style. Apart from the Galina Ulanova Museum in the Kotelnicheskaya Embankment Building, are there any times at which members of the public are offered guided tours of the interior of any of the buildings?
I realize that all seven buildings are in use as apartments, hotels, offices, etc., and so their occupants may not want tourists tramping around all the time. But on the other hand, many organizations or entire cities do have occasional "open house" nights (such as the annual Open House London festival) where it is possible to tour buildings that are normally closed to the public. Perhaps Moscow also has such a festival that includes some of the Seven Sisters?