We elucidate the relationship between space-filling curves and the Euc
lidean Traveling(2) Salesman Problem (TSP) by reference to a particula
r space-filling curve whose scaling behaviour is strongly related to t
he conjectured scaling behaviour of the optimal TSP tour. We suggest t
hat space-filling curves can be used to generate testbed TSPs: sets of
points which in the limit cover a planar surface and for which tours
of minimum length are known.