Actually it is closed for research and you can not visit it. To bad and they didn,t even mention it on the internet.

In Ciutadella Park is situated some interesting buildings along Passeig de Picasso. Geology Museum is one of them. It is an interesting neoclassic building from late 18th century.

The geological exhibition is now in the excellent Blau museum where Diagonal meets the sea. Nothing to see here. Same goes for the nearby zoological museum, although the building is nice.