A、Because there are priceless treasures. B、Because it is the most beautiful building. C、Because it is the tomb for an empress. D

Few buildings on earth can compete with the legendary beauty of the Taj Mahal. Towering over the ancient Indian city of Agra, the Taj Mahal is the grandest monument to love ever created.
    The lovers in this story are Ire 17th century Indian emperor Shah Jehan and his wife Mumtaz Mahal. She took a leading role in advising him, which is something unique for a woman to do for a husband who’s an emperor. Over the course of their nineteen-year marriage she gave birth to 14 children.  But in 1631 while trying to deliver their fifteenth -- she tragically died. He was heartbroken when she died. And after her death, he decided to build the world’s greatest monument ever built, for love.
    He ordered the royal architects to design the most beautiful building the world had known and decided to name it after his beloved, Mumtaz Mahal. He summoned twenty thousand laborers and sent wagons to all corners of his empire in search of precious metals and jewellery. And after seventeen years of construction, the monument was completed and his beloved empress was moved to her final resting place.