Spitball Army

Card is titled: “Frankfurt a. M.  Die Forsthausstrasse.”

Photo postcard of Die Forsthausstrasse in Frankfurt, Germany.  Judging by the wooden cart and streetcar in the photograph, I would guess the card dates from the very early 20th century.

Die Forsthausstrasse began as a wide walking avenue and was later developed into a road for automobiles (according to the German Wikipedia page, which can be read in an English translation here).

On the back of the card, the following words are stamped:

Postkarte.
Weltpostverein
Carte-Postale.
Union Postale Universelle

Raum für schriftliche Mittellungen.