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 hidden for 65,000 years. 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 hidden for 65,000 years. Archaeology Phys.org – latest science and technology news stories