You can see the polar ice caps in these two pictures of Mars. The ice cap at the North Pole is visible near the top of the left picture. The ice cap at the South Pole is visible near the bottom of the right picture. Both of these pictures were taken by the Hubble Space Telescope.
Images courtesy Phil James (Univ. Toledo), Todd Clancy (Space Science Inst., Boulder, CO), Steve Lee (Univ. Colorado), and NASA [North Pole image]; and NASA, J. Bell (Cornell U.) and M. Wolff (SSI) [South Pole image].