the mysteries of TAJ MAHAL

a week before,i read something about taj mahal.it was intresting and shocking.....but,i dunno weather its true or not....what i read was....
1) taj mahal wasn't built by shahjahan.
2) when archeologist tried to estimate the age of taj mahal,it aged nearly 40 years before the birth of mohal empire....
3)if you say that the word "taj" points out mumtaj,its also false.bcuz,her name is "mumtaz" and not" mumtaj"
4)the real name of taj mahal is "teja mahal" which means the "temple of the hindu god shiva"......
5)inside taj mahal,there are 46 chambers and only 4 of them are opened for the public and researchers...no one knows whats inside the remaining......
6)no islamic building structure is built in such a shape as taj mahal is........