diff --git a/main.py b/main.py
index 4640f23..98f86f9 100644
--- a/main.py
+++ b/main.py
@@ -35,7 +35,12 @@ def countries():
 def monthly_average(country: str, city: str, month: str):
     return data[country][city][month]
 
+# Create a new route that exposes the cities of a country:
+@app.get('/countries/{country}')
+def cities(country: str):
+    return list(data[country].keys())
+
 # Generate the OpenAPI schema:
 openapi_schema = app.openapi()
 with open(join(wellknown_path, "openapi.json"), "w") as f:
-    json.dump(openapi_schema, f)
\ No newline at end of file
+    json.dump(openapi_schema, f)