Stonehenge
There are several theories about how these bluestones arrived at Stonehenge. The long-distance human transport theory says the Stonehenge builders brought the bluestones from the Preseli Hills in modern-day Pembrokeshire, Wales - 160 miles (260 km) away from Stonehenge. In 2011, a megalithic bluestone quarry was discovered at Craig Rhos-y-felin, near Crymych in Pembrokeshire. This supported the long-distance human transport theory.