The Geology Museum, also known as the Martorell Geology Museum, is the third building on the Passeig dels Til·lers, and the first municipal project expressly designed to house a museum.

It was designed by Antoni Rovira i Trias, who directed the construction work between 1879 and 1882, and it has a clear classicist style. The museum displays collections of petrology, mineralogy, and palaeontology, and also houses fossils of animals and plants from 120 million years ago.