A large volcanic rock with a flat top and steep sides in the shadow of Mt. Erebus in Antarctica, Castle Rock gets its name from its distinct shape. Ropes have been installed to assist climbers with the ascent. Robert Falcon Scott named the unusual formation after the British National Antarctic Expedition from 1901 to 1904. Subsequent early Arctic explorers continued to use Castle Rock as a navigational landmark. Today, visitors to the southernmost continent in the summer months can still clamber up the slopes of Castle Rock. There hiking trails from…