Riksveg 5, Sogndal, Sogn og Fjordane, Scandinavia, Norway, Europe
If you want to find experienced tunnel constructors, Norway might be the spot to look for. The density of tunnels running in all directions through the mountains is amazing. Even roundabouts and crossings are built inside massive rocks.
Canon EOS 6D, EF24-105mm F4L IS USM @ 24 mm, 1/15s F4,0, ISO 25600; RAW