There is an ice sheet in Greenland that dates back to the Pleistocene
The island country of Greenland has quite an ironic name since it is mostly covered by the Greenland Ice Sheet. This is one of the last, if not the last Pleistocene glaciation left in the Northern Hemisphere.
In 1966, a group of researchers dug 1.4 km down into the ice sheet to take a sample of the core. There, they found well-preserved plant fossils and other biomolecules, which suggests that it melted and reformed in the last million years.