Checkpoint Charlie has become a tourist attraction. Just as the Colosseum in Rome has the fake gladiators who charge for a photo, so does this landmark now have cute girls in replica US Army uniforms available for photo ops. You can also have your passport stamped with a DDR stamp by a guy dressed as a Russian soldier.
This is actually a replica of the original shack that was removed in the early 90's. The photo of the Russian Army officer is duplicated on the other side - same kid (and he is a kid) in a US Army dress uniform. You can see a bit of yellow fence on the right; that is former No Man's Land area, the shoot-on-sight barrier prior to the final Wall, the one we saw from our side.