This week, NASA scientists analyzing the most likely path of Asteroid 2004 MN4 projected it will be visible to the naked eye when it flies past Earth on April 13, 2029. According to a Space.com(1) article, "There has been no event like this in modern history." Start making travel plans now, the 1000-ft wide rock will only be visible from Europe, Africa and western Asia.

1. http://www.space.com/spacewatch/050204_2004_mn4.html