The Cradle of Humankind, South Africa
The Cradle of Humankind is the site of many hominid fossils, including the 2.3-million-year-old fossil Australopithecus africanus (discovered in 1947). At the bottom of the main cave lies an underground lake that is yet to be explored.
The South African government has banned diving exploration after a group of divers ran out of oxygen and perished, and there have been further efforts to discover what lies beneath the lake’s murky depths. Legend has it that one of the divers in the group wrote a message in the sand to his fiancé as he was running out of air – a hauntingly beautiful memento of a dangerous, unexplorable place.