San Francisco, California, USA

Postcard sent by A_V

https://www.postcrossing.com/postcards/US-1909284

 Moscow, Russia

Panoramic view of the Kremlin

Postcard sent by Maria

https://www.postcrossing.com/postcards/RU-1271908

 Karlovy Vary, Czechia

Postcard sent by Pavla

https://www.postcrossing.com/postcards/CZ-222147

 Kyiv, Ukraine

Postcard sent by Kai

https://www.postcrossing.com/postcards/UA-383747