In the picture you can see the sun setting behind one of the buildings in Fatehpur Sikri.
The city of Agra is rather big, and its tourist attractions are quite spread out. The best way to move around is by taxi or auto rickshaw.
Before stopping a taxi ask the prices of the most common rides (from your hotel to the Taj Mahal, from the Taj Mahal to the Red Fort, from Red Fort to Baby Taj, etc).