Apparently there was more than one Buran. This is all that is left of the one that actually went into space-
The hangar collapsed onto it. That is the right-side windshield on the bottom there.
According to Wikipedia there are 5 known Buran craft-
1. A test aircraft, registered under the Czech aviation registry as OK-GLI, was bought by the Sinsheim Museum (a prominent German aviation museum) and is stored in Bahrain. This one never flew in space.
2. Buran itself, which was destroyed as shown above. Spent 3 total hours in orbit in space.
3. Ptichka, the second orbiter, which is pretty much complete but is stored in Kazakhstan, home of Borat Sagdiyev. It never went into space.
4. Aircraft 2.02 is being dismantled at the factory at Tushino.
5. Aircraft 2.03 was barely even built and is now gone, and is probably beer cans in small towns across Siberia.
I would assume that the Buran orbiter shown on the An-225 is the actual Buran that was destroyed.