The German Fountain stands at the northern end of Istanbul's Hippodrome, and it is the youngest thing there by about fifteen centuries. Built in 1901, it was a gift from Kaiser Wilhelm II to Sultan Abdulhamid II, shipped from Germany in pieces and reassembled on site.

The timing was not coincidental. That same year, the Ottoman government granted Germany the concession to build a railway from Ankara to Baghdad. Diplomacy has always had a flair for the decorative gesture.

Look up inside the dome, and you'll find gold-plated mosaics: Prussian blue medallions bearing the letter W, a crown, and the numeral II alongside the green monogram of Abdulhamid. Two empires, in gilded tile.

VoiceMap's audio tours use the fountain to unpack the geopolitics of the late Ottoman period, connecting its ornate dome to the railway concessions and European rivalries that would, within thirteen years, help ignite the First World War.