Cut into a Gibraltar cliff face overlooking the Alboran Sea, a cave opening leads back in time to one of the earliest manufacturing sites on the planet—a Neanderthal-built tar distillation oven ...

But the newfound hearth, seemingly dug into the floor of a cave in what is now Gibraltar, shows that Neanderthals were skilled engineers who had fine-tuned the glue-making process. "The structure ...

The Travel Show's Christa Larwood takes a tour and visits the more recently discovered "stay behind" cave created during World War Two. It was planned that if the Gibraltar fell into enemy hands ...