What is inside Taj mahal pillars?

There are no pillars inside the Taj Mahal. The main chamber of the Taj Mahal is a large, octagonal room with four arched niches, each of which contains a cenotaph. The cenotaphs are made of white marble and are inlaid with semi-precious stones. The walls of the chamber are also made of white marble and are decorated with intricate carvings.