This is the red sandstone building (a material used by the Mughals to build a huge number of their structures) that forms the gateway to the white marble structure of the Taj Mahal. If you look closely, you can see the Taj from within the opening in the center of the gateway.
Tip: When taking a view of a structure, be sure to maintain a proper symmetry in the framing of the photo. If the photo comes out unsymmetrical without a compelling reason, it can look awkward.
Want to get tips for improving your photography ? Get Photo Tips from this blog.