Cars drive past a road sign indicating the city of Berlin's boundary with Brandenburg, near Berlin's Mahlsdorf locality, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

Cars drive past a road sign indicating the city of Berlin's boundary with Brandenburg, in Berlin's Mahlsdorf locality, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A car drives past a road sign indicating the city of Berlin's boundary with Brandenburg, in Berlin's Mahlsdorf locality, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A road sign indicates the city of Berlin's boundary with Brandenburg, in Berlin's Mahlsdorf locality, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A road sign indicates the city of Berlin's boundary with Brandenburg, in Berlin's Mahlsdorf locality, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A road sign indicates the city of Berlin's boundary with Brandenburg, near Berlin's northeastern district Marzahn, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A road sign indicates the city of Berlin's boundary with Brandenburg, near Berlin's northeastern district Marzahn, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)

A road sign indicates the city of Berlin's boundary with Brandenburg, near Berlin's northeastern district Marzahn, on July 30, 2026. The German capital's boundaries date back to October 1, 1920 when the Greater Berlin Act came into effect, expanding Berlin's area overnight from 66 square kilometers to nearly 880 square kilometers. (Photo by John MACDOUGALL / AFP via Getty Images)