VirtualTravel.CZ (click)is a server with 2,481 virtual tours from the whole Eurasia, especially from Czechia (1801 tours), especially from Prague (342 tours).
That includes Pilsen (89 tours).
Every tour may be moved in all directions, zoomed in/out (mouse wheel), and extended to the full screen mode. A fast direct link for a representative presentation:
Entering the Prague Castle (click)Additional panoramic views of Prague are available at norc.cz. And by the way, Google has been mapping the streets of Prague so "Street View" of the city will be added to Google Maps by the end of 2009, making Czechia the 10th country with the service or so.
Hluboká Chateau (click)