The letter is being held in a glass case
The last letter written by Mary Queen of Scots, which is on display in Edinburgh, has been visited by more than 1,000 people a day.
They have been flocking to the National Library of Scotland to see the 422-year-old manuscript, written just six hours before the monarch's execution.
The priceless letter went on public display on Tuesday.
It will be displayed for just a week, to mark the official opening of the library's new visitor centre.
The letter is addressed to Henri III of France, brother of her first husband.
It is very rarely on public display for preservation reasons.
Martyn Wade, a National Library of Scotland librarian, said: "People have been pouring through our doors since we unveiled Mary Queen of Scots' last letter.
"One of our senior curators was saying that we haven't seen this many visitors since we put the Dead Sea Scrolls on display in the 1960s.
"It really is fantastic to see such passion and enthusiasm for this amazing piece of Scotland's history. It has also given people a chance to see our great new facilities, which enhance the visitor experience considerably."
It is unknown if or when it will go on public display again.