The Louisville Zoo continues work on the next phase of Glacier Run, the Arctic themed exhibit that will feature polar bears, sea lions, and Amur Tigers. Visitors will be able to observe the animals in a mock-up of a Canadian mining town, complete with a gold mine and a general store. A timber walkway above the town’s main street will allow polar bears to amble right over the heads of spectators. On the outskirts of the town, huge walls of ice and stone are rising into the sky. These cliffs have been constructed out of concrete and rebar by the Cemrock Company of Tucson, AZ, which also built the zoo’s award winning Gorilla Forest exhibit. Cemrock artists have labored to give the concrete life-like details such as lichen and stress fractures.The sea lion enclosure at Glacier Run opened on June 30. Zoo officials hope to open the polar bear enclosure in early 2011.(Story and photos by WFPL intern Simon Levine)