A road sign on Hamburg's Max-Brauer-Allee warns motorists that older diesel vehicles are banned from using this stretch of road. Hamburg is the first German city to ban older diesel vehicles. Daniel Bockwoldt/AFP/Getty Images hide caption
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Police on patrol in three German airports have launched investigations into 20 families that pulled their children out of school to go on vacation. AFP/Getty Images hide caption
This is one of the last pictures taken of Adolf Hitler in his bunker in Berlin in 1945 as he shakes hands with General Field Marshal Ferdinand Schoerner. Anonymous/AP hide caption
U.S. Ambassador to Germany Richard Grenell (left) and German President Frank-Walter Steinmeier greet the media during Grenell's accreditation process at the Bellevue Palace in Berlin on Tuesday. Michael Sohn/AP hide caption
A quarter million Herero are estimated to live in Namibia today, with the population growing in recent years. Harry Hook/Getty Images hide caption
President Trump kisses German Chancellor Angela Merkel during her arrival at the White House on Friday. Alex Wong/Getty Images hide caption
President Donald Trump speaks during a news conference with German Chancellor Angela Merkel in the East Room of the White House on Friday. Evan Vucci/AP hide caption
Merkel's Low-Key Visit With Trump Focuses On Trade, Foreign Policy
A Jewish man wears a yarmulke, also called a kippa, during a meeting on "the German and French perspectives on immigration, integration and identity" organized by the American Jewish Committee this week in Berlin. Michael Kappeler/AFP/Getty Images hide caption
French President Emmanuel Macron speaks with German Chancellor Angela Merkel in Brussels last month. Ludovic Marin/AFP/Getty Images hide caption
Putin (left) and Schroeder attend a test pipeline launch at a gas compressor station outside Vyborg, in western Russia, in September 2011. Alexei Nikolsky/AP Photo/RIA Novosti hide caption
A police officer stands near the scene where a car crashed into a group of people in Muenster, Germany, leaving two dead, before killing himself. Ferdinand Ostrop/AP hide caption
The entrance of the New Interior Ministry Headquarters seen in June 2015 in Berlin, Germany. Axel Schmidt/Getty Images hide caption
Cars drive along Mittlerer Ring in Munich. Germany's highest court has ruled that cities may impose bans or partial bans on diesel cars in order to bring down emissions levels. Andreas Gebert/Getty Images hide caption
To meet EU air pollution targets, Germany may make public transit free in cities struggling with poor air quality. Here, a Munich traffic jam in 2007. Johannes Simon/Getty Images hide caption