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"Paul Ludwig Hans Anton von Beneckendorff und von Hindenburg (About this sound listen (help·info)), known universally as Paul von Hindenburg (German: [ˈpaʊl fɔn ˈhɪndn̩bʊɐ̯k] ( listen); 2 October 1847 – 2 August 1934) was a German military officer, statesman, and politician who served as the second President of Germany during the period 1925-1934.

Hindenburg retired from the army for the first time in 1911, but was recalled shortly after the outbreak of World War I in 1914. He first came to national attention at the age of 66 as the victor of the decisive Battle of Tannenberg in August 1914. As Germany's Chief of the General Staff from August 1916, Hindenburg's reputation rose greatly in German public esteem. He and his deputy Erich Ludendorff would then lead Germany in a de facto military dictatorship throughout the remainder of the war, marginalizing German Emperor Wilhelm II as well as the German Reichstag. In line with Lebensraum ideology, he advocated sweeping annexations of territory in Poland, Ukraine and Russia in order to re-settle Germans there."
en.wikipedia.org/wiki/Paul_von_Hindenburg

see

Original photo is by A. Grohs.

Princess Victoria Margaret Elizabeth Marie Ulrike of Prussia (17 April 1890 – 9 September 1923) with her children - Princess Marie Luise Reuss of Köstritz (9 January 1915 - 17 June 1985) - Prince Heinrich II Reuss of Köstritz (24 November 1916 - 24 December 1993) en.wikipedia.org/wiki/Princess_Victoria_Margaret_of_Prussia Her husband, Prince Heinrich XXXIII Reuss of Köstritz: www.flickr.com/photos/library_of_congress/41317585754/

see comments at

B-59 Art Siegel Thank you for the additional information for our catalog record.

City is described at en.wikipedia.org/wiki/%C5%81%C3%B3d%C5%BA Street is probably en.wikipedia.org/wiki/Piotrkowska_Street "Piotrkowska Street (Polish: ulica Piotrkowska), the main artery of Łódź, Poland, is one of the longest commercial thoroughfares in Europe, with a length of 4.9 km. It is one of the major tourist attractions of the city.' One of the photos on the Wikipedia page was taken the day after te Germans occupied the city in 1914.

Thanks for your research swanq, and for connecting this photo to the photo on the Wikipedia page. It could well be the same main street.