Josip Rosandić
Google
Talk about a hidden gem of Prague! Even though you can clearly see it on a hill, for some reason everyone goes just to the city center, this place was almost empty as we visited. And it is definitely worth a visit, absolutely stunning 360 degree view is truly something else. The building itself is a monument and sort of museum built of stone and marble. There is also a cafe with equally stunning views, but it could've been nicer on the inside.
Oh, and the best part? It's totally free to visit, including the rooftop platform.