Taj Mahal is the 12th card of the 39 Clues cards.
"The Taj Mahal in Agra, India, is a tomb built by Shah Jahan in the 1600s when his beloved wife, Mumtaz Mahal, died. The Taj Mahal is considered one of the most beautiful buildings in the world and is decorated with carvings and inlaid with semiprecious stones. It's obvious that the Janus are involved in so glorious building--especially because the main tomb divides perfectly into four sections. Does each section represnt one of the four family branches? Many have investigated, but nothing has been found."
Top Secret Edit
The top secret contain four surveillance photos of Jonah Wizard, Ian and Natalie Kabra, the Holt twins and Irina Spasky near the Taj Mahal
This card, combined with Card 8, Card 17, and Card 21, forms the Janus Clue King Cobra Venom.