On the National Holiday in Liechtenstein on August 15, there is always a huge firework for 40 to 50 minutes. The firework is launched from the Prince's castle, but it is visible in half of the country. If you're in the center of Vaduz it is really great, since the lights are following directly down on you. And you won't be alone, since there are around 20'000 to 30'000 people coming to see it. (The country has only 35'000 inhabitants.)
To make the event even better, there are a lot of different bars, food corners, and other shows during the whole night.
And to make the day really great, you should be aware that in the morning there is free wine and beer for everyone next to the Prince's castle.
I added some picture of the firework so that you get an impression:


