Naturalis is the national natural history museum of the Netherlands, based in Leiden. It originated from the merger of the Rijksmuseum van Natuurlijke Historie (abbreviated RMNH) and the Rijksmuseum van Geologie en Mineralogie (abbreviated RGM) in 1984. In 1986 it was decided that the museum had to become a public museum and a new building was built. The new building cost about €60 million, making it the second most expensive museum building in the Netherlands.
The museum is open every day of the week from 10am to 5pm. The entry fee is €7.00 for people aged 4 to 12, €9.00 for people aged 13 to 17, €11.00 for people aged 18 to 65, and €10.00 for people aged above 65.