Library of Traveling Salesman problems from http://comopt.ifi.uni-heidelberg.de/software/TSPLIB95/ [1]
This is just the Symmetric TSP data.
Currently known best solutions are in the solutions file.
[1] Reinelt, G. "TSPLIB--A Traveling Salesman Problem Library." ORSA Journal on Computing, Vol. 3, No. 4, pp. 376-384. Fall 1991.