The historic route 66 "BEGIN" sign stands at the corner of Michigan ave and Adams St. in Chicago Illinois. You can also find the "end 66" sign at the corner of Jackson and Michigan . Why not both on the same street? Well, Adams and Jackson are both one way streets where Adams runs to the west and Jackson runs to the east.
At the end of the Route 66 is the Santa Monica Pier over the Pacific Ocean in California. It is filled with amusement park rides and there is a small information booth dedicated to the end of the Route 66. The actual end of the Route 66 is at Lincoln and Olympic, but there is no marker or anything special about the intersection. I am sure that if you have followed the true Rte 66 then it will be the place to end, but why not come and enjoy the festivities of the pier where Dan Rice was responsible for placing this "End of the Trail" sign at the pier.