Day 4 saw us out of bed at the ungodly hour of 5am or something to catch a train from Copenhagen to Gothenburg, Sweden. The train journey involved crossing
Øresund Bridge, part of the link connecting Sweden and Denmark across the Øresund strait (I stole this panorama from Wikipedia). This is a combined twin-track railway and dual carriageway bridge-tunnel, and is the longest road and rail bridge in Europe at 7.8km. Construction began in 1995 and was completed in 1999 three months ahead of schedule despite a setback upon the discovery of 16 unexploded World War II bombs lying on the sea floor. The bridge doesn't span the entire distance between Sweden and Denmark - the remaining 4km of the link is the
Drogden Tunnel which sits in a trench dug in the seabed on the Danish end of the link. The reason for the tunnel is so the bridge does not interfere with planes from nearby Copenhagen Airport, and also to provide a clear channel for ships to pass by. Pretty impressive stuff!