  We construct a high resolution mass map of the z=0.39 cluster 0024+1654,
based on parametric inversion of the associated gravitational lens. The lens
creates eight well-resolved sub-images of a background galaxy, seen in deep
imaging with HST. Excluding mass concentrations centered on visible galaxies,
more than 98% of the remaining mass is represented by a smooth concentration of
dark matter centered near the brightest cluster galaxies, with a 35 h^{-1} kpc
soft core. The asymmetry in the mass distribution is <3% inside 107 ~h^{-1} kpc
radius. The dark matter distribution we observe in CL0024 is far more smooth,
symmetric, and nonsingular than in typical simulated clusters in either Omega=1
or Omega=0.3 CDM cosmologies. Integrated to 107 h^{-1} kpc radius, the
rest-frame mass to light ratio is M/L_V = 276\pm 40 h (M/L_V)_solar.
