The incredible Magdeburg Water Bridge in Germany

The Magdeburg Water Bridge is a navigable aqueduct in Germany that connects the Elbe-Havel Canal to the Mittelland Canal, and allows ships to cross over the Elbe River. At 918 m, it is the longest navigable aqueduct in the world.
The Elbe-Havel and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe. Ships moving between the two had to make 12 km detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, and then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo.

The construction of the aqueduct was started in the 1930s but due to the World War II and subsequent division of Germany it remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003.