Scientists found the structure , built in 178 BC , using Lidar technology . Lidar 's pulsed light can reveal structures that are hidden beneath trees . Main fort was on a hilltop 1.2 miles ( 2km ) from shore of Bay of Muggia . Lidar artefacts were also found , including hobnails for military shoes . Timing of the building of the fort coincides with the second Istrian War .
Scientists found the structure , built in 178 BC , using Lidar technology . Lidar 's pulsed light can reveal structures that are hidden beneath trees . Main fort was on a hilltop 1.2 miles ( 2km ) from shore of Bay of Muggia . Roman artefacts were also found , including hobnails for military shoes . Timing of the building of the fort coincides with the second Istrian War .