The world’s longest train tunnel that now connects Switzerland and Italy will go into service June 2016. The 38-mile-long Gotthard Base Tunnel will allow trains to travel between Zurich and Milan in just under three hours, shaving an hour off the current time.

The price tag the completed tunnel is $10.3 billion. It took 2,000 workers twenty years to build, which included shifting 31 million tons of earth using two million truckloads. Boring machines were able to cut through up to 100 feet of rock every day. There are actually two parallel tunnels so trains can run in both directions.