His likeness appears on stamps, coin and currency, and his face joins three other famous presidents, Washington, Jefferson, and Roosevelt, in the famous carving on Mount Rushmore, visited by thousands of tourists from around the world every year.
His Gettysburg Address has been memorized by millions of school children, most of whom remember at least a part of it until their dying day. It is a rare individual who does not immediately recall the Gettysburg Address when he hears the words "Four score and seven years ago . . ."
His birthday is celibrated as a national holiday every year, undiminished by the fact that recent years have seen a dual celebration with George Washington, their birthdays celebrated together as Presidents' Day.
This photo of Lincoln was the basis for our $5 bill
The Presidential mansion, the White House, honors Lincoln by naming one of the bedrooms after him, and a night in the Lincoln Bedroom is highly coveted by guests of every President.
His name has been given to countless schools, highways, streets, parks, programs, cities, and even ships. After his funeral dozens of songs and dirges were composed in his honor. None was more famous than Walt Whitman's celebrated "O Captain! My Captain!" Whitman's lecture on Lincoln was in great demand for twenty years after the President's death.
But the nation's appreciation is most obvious in the edifice in Washington which bears his name: The Lincoln Memorial.
Construction of the Lincoln Memorial 
The finished memorial
This memorial on the National Mall symbolizes our nation's capitol every bit as much as the Washington Monument. It is a favorite destination of tourists to Washington, with millions visiting annually. The scene of countless speeches over the years, some which have become famous in their own right, the Lincoln Memorial symbolizes more than anything the man who brought the nation through her darkest hours.
William Howard Taft, President Warren G. Harding, and Robert Todd Lincoln, son of Abraham Lincoln, at the dedication of the Lincoln Memorial
