The first photograph is of a piece carved out of marble on top of an indoor doorway.
Many of the window designs on the pillars in the photo below are faded, but one can imagine what they must have looked like at one time, with their colors intact.
The image below showcases a part of the high ceiling design in one of the rooms.
The photograph below did not come out well, a pencil drawing of the same design has been made. That shows the pattern more clearly.
The photographs below show the striking marble balcony railings/parapets.
You can see the intricate patterns below the marble railing in the top and bottom part of the photo.
Here you can see the typical hexagon design on a railing near the green lawn.
This is a design on the parapet.
(These photos are courtesy Purpl-er)
Related Images: Designs and patterns from Taj Mahal interiors or Taj Mahal Sketch and Silhouettes or Balcony and railing designs of old Pune houses or wadas
Actual photos of The Taj Mahal at Agra or Red Fort at Agra or the Agra Fort - Photographs
Or simply Silhouettes of Mosques
If you are looking for a sample of Islamic art from Turkey try this post: Designs from the Blue Mosque, Istanbul or The Great Mosque of Xian, China