I'm sure Mohammed went on a magic ride to the Taj Mahal, thus securing its importance in Islamic history. Even if it's not in the Koran (like Jerusalem).
I'm just sure of it. /sarc
If Islam can make up a story about Muhammed going to heaven on a horse from Jerusalem, they can make up a story about Muhammed going to heaven from the Taj Mahal as well. Muslims will believe anything that they think to be in their favor.