On June 14, 1940, troops of the German Wehrmacht occupy Paris. The picture shows the victory parade of the German 30th Infantry Division on the Avenue Foch in front of General Kurt von Briesen 1886-1941. Before photo: Deutsches Bundesarchiv, after photo: Nicolai Wolpert.

Burning Peterhof Palace after the Nazi invasion. 1941 September. Before photo: Unknown author, after photo: Sergey Larenkov.

Catholic house transformed by the Germans into a cinema. 1941. Before photo: Unknown author, after photo: Filip.

Captured German Soldiers at Juno Beach shortly before their deportation to England. In the background, the villa "Denise et Roger" can be seen. It is one of the most famous places in the time of D-Day. 1994, June 6th. Before photo: Ken Bell, after photo: Lena.

The city center and US troops in June 1944. Several US vehicles are parked on the Quai de Caligny west of the rotary bridge. Before photo: Unknown author, after photo: Hegemonus.

A crowd celebrates the arrival of Allied troops during a victory parade for the liberation of Paris, as suddenly shots from a sniper on one of the roofs are heard. Quickly the Parisians scatter for cover. Although the city was officially abandoned by the Germans, small bands of snipers remained active, which made the victory celebrations risky. 1944, August 29. Before photo: National Archives and Records Administration, Washington, after photo: Nicolai Wolpert.

Captured German soldiers await their transport at the railway station in Bernières-Sur-Mer. Today, the old station building serves as the tourist office. 1944. Before photo: Unknown author, after photo: Lena.

Southside of the Aachen Town Hall at Katschhof at the end of World War II. The town hall is one of the most important buildings in the historic center of Aachen. It was repeatedly rebuilt and expanded over many centuries. The oldest part of the monument is the Granusturm from the time of Charlemagne. During World War II, the town hall suffered badly from several bombing raids. On 14 July 1943, the roof and both City Hall towers burned out, the steel skeletons of the tower domes bent by the heat dominated the appearance of the town hall for a few years. Rebuilding followed in the 50s; last, the two-tower caps were finished in 1978. Before photo: Stadtarchiv Aachen / Stadtbildstelle, after photo: Nicolai Wolpert.

Priest 105mm self-propelled guns of the French 2nd Armoured Division in front of Notre Dame in Paris, 26 August 1944. Photo of the Imperial War Museum (IWM). Before photo: IWM (BU 127), after photo: Nicolai Wolpert.

August 1944. Since 1940, Paris is occupied by German troops. As the Allied army approaches the capital, this encourages the Parisian population to resist. It comes to a general strike, followed by open revolts. Everywhere in the city (such as here in the rue St. Placide) barricades are erected, and around the 20th of August, the Resistance has taken control of the city. Although militarily inefficient, these barricades had a symbolic character for the Paris uprising. Before photo: Jean-Jacques Lebel, after photo: Nicolai Wolpert.

In May 1943, the Allies dropped specially developed "bouncing bombs" on select dams in Germany's industrial heartland. The Möhne dam was the hardest hit and 1600 civilians died in the flooding. The attack was dramatized by The Dam Busters (1955). Before photo: Schalber, after photo: jamesvdm.

German soldier in Alkmaar at the Langestraat. 1941. Before photo: Unknown author, after photo: Regionaal Archief Alkmaar.

German officers in the headquarters of the Wehrmacht in Huize Voorhout in Alkmaar. 1942. Before photo: Unknown author, after photo: Regionaal Archief Alkmaar

In the background is the Assumption Cathedral. 1941. Before and after photo: Lena.

Destroyed tram and houses in the Rentforterstrasse in Gladbeck, end of the Second World War. The house with the gabled facade in the background is the main entrance of the St. Barbara hospital. Today there are no more tramways in Gladbeck. 1945. Before photo: Vestische Straßenbahnen GmbH, after photo: Nicolai Wolpert.

June 1944. Before photo: A. Grimm (Bundesarchiv), after photo: Lena.

Paris in September 1944, shortly after the recapture. To protect against potential German counterattacks, an anti-aircraft gun is provisionally installed by American soldiers in the park of the Palais de Chaillot. Before photo: anonym, Agence Gamma Rapho, after photo: Nicolai Wolpert.

San Lorenzo, Rome after the allied bombing on 19 July 1943. Before photo: LaRepubblica, after photo: GoogleMaps.

The villa "Denise et Roger" is one of the most famous places of the time of D-Day. The region around Bernières-Sur-Mer was liberated by Canadian soldiers on June 6. 1944. Before photo: Archives Nationales du Canada, after photo: Lena.

Barricade on the Pont Neuf at the intersection with the Quai de Conti, August 1944. Since 1940, Paris had been occupied by German troops. As the Allied army approached the capital, this encouraged the Parisian population to resist. It came to a general strike, followed by open revolts. Everywhere in the city barricades were erected, and around the 20th of August, the Resistance took control of the city. Although militarily inefficient, these barricades had a symbolic character for the Paris uprising. Before photo: Bibliothèque Nationale de France, after photo: Nicolai Wolpert.

The Opera Garnier decorated with swastikas for a festival of German music during the Occupation of Paris. The Germans organized a series of concerts in the occupied city, including by the Berlin Philharmonic, conducted by Herbert von Karajan. 1941. Before photo: Deutsches Bundesarchiv, after photo: Nicolai Wolpert.

The school building destroyed by the Nazi bombing. 1941. Before photo: Unknown author, after photo: Sergey Larenkov.

San Lorenzo after the bombing in 1943, Princess Marie-José inspecting the damage. Before photo: Instituto Luce, after photo: GoogleMaps.

On 10 September 1943, Porta San Paolo was the scene of the last attempt by the Italian army to avoid the German occupation of Rome On the evening of the 9th, the 21st Infantry Division "Granatieri di Sardegna" moved towards the center, engaging in fierce fighting on the Via Laurentina (Tre Fontane locality), around the Exposition Hill (current EUR district) and Forte Ostiense. The German troops marched on the Via Ostiense, towards the heart of Rome. Despite the overwhelming numerical superiority and armament of the enemy, the walls of Porta San Paolo became a defensive bulwark of resistance, protected by barricades and vehicle carcasses. The grenadiers also fought here with courage, along with the numerous civilians. Before photo: ComunediRoma, after photo: StuartSW6.

Wehrmacht Soldiers In the city of Schagen in The Netherlands. 1940. Before photo: Foto Niestadt, after photo: Regionaal Archief Alkmaar.

September 9th, 1943. Before photo: LaRepubblica, after photo: StuartSW6.

An old bunker is now used as a plant shop. Old Photo is taken in 1945, the new one in 2018. Before photo: Unknown author, after photo: Regionaal Archief Alkmaar.

Aerial shot of Lodz made at the end of WW2 (1942) compared with Google Earth's view from 2017. Before photo: Unknown author, after photo: Google Earth.

Mobilization Dutch soldiers before the "Ambachtsschool" in Alkmaar, The Netherlands. 1939. Before photo: Unknown author, after photo: Regionaal Archief Alkmaar.

After parts of the city have been liberated by the Allies, horse carts bring food to those who took refuge in the Abbey of Saint-Étienne. 1944, July 10th. Before photo: National Archives Canada, after photo: Lena.