(worldkings.org) Ice caves are the amazing wonders of nature, hiding under the glaciers. Many tours to the glaciers include visiting the caves. Some caves are not open for everyone, since they are difficult to navigate. However, many of them were discovered by the fearless adventurers. If you are going to visit any ice cave that is not monitored by any tourist service, you have to remember that it may collapse any time, so be extra careful.
(Worldkings.org) Los Glaciares, of which 30% is covered by ice, can be divided in two parts, each corresponding with one of the two elongated big lakes partially contained by the park. Lake Argentino, 1,466 km2 (566 sq mi) and the largest in Argentina, is in the south, while Lake Viedma, 1,100 km2 (420 sq mi), is in the north.