One of the 7 wonders of the World, Taj Mahal is visited by tourists from around the world and it may be ready to close its door forever. Yes, that’s correct! The magnificent structure usually has 3 to 4 million tourists walk through its doors, and this huge volume of tourist influx is causing the destruction of the building. According to the caretakers of this mausoleum, there are several factors degrading this world heritage- air pollution, river pollution and the decaying of the wood which supports the structure. It is believed that the visitors will have no more than four years to visit this amazing architectural wonder.