I'd almost pay 100 euro NOT to have to go to a tank museum. Sounds extremely boring.
But it's sounds a bit silly since it's a MUSEUM. I mean, it's understandable if foreigners can't view the latest models of tanks. But the old historical ones... What's the harm?

Most countries have some areas or places that foreigners can't go to though, or areas that you need security clearance to enter. I've come across it in several countries.

I read in a guide book that there are whole cities in Russia that foreigners can't normally go to. Several cities (not sure which ones) and also areas in the Caucasus and border areas. I wonder how they check to make sure that foreigners don't go to these places in the Caucasus.