If going to Fatehpur Sikri dargah, inside Buland Darwaza, do not purchase Thread to tie inside dargah, people will sell it at very high rates. Sometimes 50 to 100rs also.
Better ask someone inside the dargah or Priest inside. They will give that thread without charging anything.
Its one of the most divine experience of my life and difference felt between outside and inside dargah.
Do...
more... visit Sikri once along with Dargah. Both are amazing.