If you want to send a physical postcard without finding a stamp, there are modern ways to do it.
A classic viewpoint, especially beautiful when snow-covered in winter. Mountain peak
Offers a serene, elevated perspective of the Vltava river and the city's south side ( Pohled z Vyšehradu ). Prague Castle OpenPrague 1, Czechia
A popular app by Czech Post that lets you turn your own photos into physical postcards. They print them in the Czech Republic and deliver them worldwide.