One of the great architectural marvels of our time has just been approved by seven out of eight parliamentary factions in Denmark. The state-owned firm Femern A/S will build a tunnel from the German island of Fehmarn to the Danish island of Lolland. Both islands have connections to the mainland. The project's budget has been set at 5.1 billion euros, or $7 billion. Construction will begin in 2014, after teams from Denmark and Germany produce environmental impact reports. The tunnel is expected to be ready for traffic in 2020.