According to the Hanfi fiqa interpretation of 9:28, the non-Muslims pagans are not allowed to pray in Khana Kaba, though they can visit. This is because according to the pre-Islamic tradition some of the tribes actually used to circle the Kabba naked & had other rituals that were deemed inappropriate.
There are also Ahadiths that show that when different crowds of people would visit AnHazoor (saw) in Madina, many of them Christians, he would let them pray inside his mosque.
i am totally against this 1, i don't agree with any non muslims being allowed to visit makkah and madinah or any other holy place inside the daaira of islam.