Lugaritz-Morlans commuter tunnel, San Sebastian, Spain

The bike path connecting the neighbourhoods of Ibaeta and Amara, in Donostia, runs through a tunnel almost one kilometre long. It is actually an old railroad tunnel that went out of use. Going through it makes you feel like you are entering a time frame that does not belong to either end of the tunnel. Not only it is visually quite strange, but there is also a sudden drop in temperature. Humidity is very intense. During the few minutes it takes to go from one end to the other, the murmur of the city disappears, and the only sounds are the ones from the tyres and your own pedalling, reverberated by the dull echo of the tunnel.