The Øresund Bridge is an amazing structure spanning from Denmark to Sweden. It runs 8km or 5 miles in length and is both a bridge and tunnel combination. The tunnel portion was created so that the bridge would not interfere with air traffic from Copenhagen's airport. It also allows for ships to have a clear channel and prevents ice floes from blocking the strait.
The bridge runs nearly 8 km (5 miles) from the Swedish coast to the artificial island of Peberholm in the middle of the strait, then a 4 km (2.5 mile) tunnel to the Danish island of Amager. The Øresund Bridge is the longest combined road and rail bridge in Europe, and connects two major metropolitan areas: Copenhagen, the Danish capital city, and the major Swedish city of Malmö. It connects the road and rail networks of Scandinavia with those of Central and Western Europe. -Wikipedia
The architecture firm Dissing + Weitling completed the project in 1999 costing a total of $5.7 Billion dollars. It is forecasted that the bridge will pay for itself by 2035. Being a toll bridge and demanding a hefty fee ~$55 (~45 euro) [one way!!] the Øresund Bridge is definitely cheaper by train. You can buy a pass if you plan to use the bridge more frequently.
Due to high longitudinal and transverse loads acting over the bridge and to accommodate movements between the superstructure and substructure, it has bearings weighing up to 20t each, capable of bearing vertical loads up to 96,000 kN in a longitudinal direction and up to 40,000 kN in transverse direction. The design, manufacturing and installation of the bearings was carried out by the Swiss civil engineering firm Mageba.