[SunkenCiv]

Thanks BBell and Rodamala.

[Fred Nerks]

Stonehenge secrets revealed by underground map

Techniques used by the team allowed them to "see" through the ground to uncover new ancient monuments

[Fred Nerks]

FIFTEEN PREVIOUSLY UNKNOWN MONUMENTS DISCOVERED UNERGROUND STONEHENGE

The Stonehenge Hidden Landscapes Project used ground-penetrating radars and GPS-guided magnetometers to produce a 3D map of a four-square-mile area. Credit: Henrik Knudsen, with thanks to National Trust.