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A 941-meter-long aqueduct stretches across the Alcântara Valley in the Portuguese capital, Lisbon.

One of the dunes of Blériot-Plage, west of Calais, was crowned with a command post in the autumn of 1943. The coastal batteries of Waldam, Oldenburg, Bastion II, Fort Lapin, Sangatte and Lindemann were controlled from here.

During the Second World War, the Germans built an observation bunker between Zuydcoote and Leffrinckoucke on top of the dunes.

Like the capital, Berlin, the German port city of Hamburg was fortified with two concrete Flak Towers ('Flaktürme' in German) between 1942 and 1944.

In the German port city of Hamburg, a complex of neo-Gothic brick warehouses, the Speicherstadt, was built on islands in the Elbe between 1883 and 1927.

With the closure of the Saint-Quentin headframe in 1971, slate mining in Rimogne, France, ended.

On the night of April 25 to 26, 1940, the British Royal Air Force bombed the German capital Berlin. For Nazi leader Adolf Hitler, it was unpalatable to have bombs hit the capital of his Third Reich.

In the run-up to the Second World War, Adolf Hitler ordered the construction of a defense line in the west of the country, the so-called West Wall. You will still find hundreds of meters of tank barriers in Aachen, Germany.

The monastic ruins of Tintern Abbey rest on the banks of the Wye in Wales. Like the abbey of Villers-la-Ville in Belgium, Tintern Abbey was populated by monks of the Cistercian Order.

In the Herzberge landscape park, a green oasis in Berlin's Lichtenberg district, the Queen Elisabeth evangelical hospital was built at the end of the nineteenth century and was heated from a separate boiler room.