The private residence of the Swedish royal family is located in the outskirts of Stockholm, on the shores of lake Mälaren.
The palace can be visited (at least partially), as well as its Baroque and English gardens. It is not the only public institution that is open to the public in Sweden though: Stockholm City Hall and the Royal Palace are also important tourist attractions.
This gives me an impression of openness. Without any further knowledge, I would say that the Swedish public institutions are willing to be transparent to their visitors, and this is something that does not happen in many other countries.
Its particular location (at the shore of a lake and surrounded by woods) makes Drottningholm Palace an inspiring place, specially by sunset, when few visitors are around and the fading lights make the palace, its gardens and its statues very picturesque.