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.
The current museum is known for the numerous objects in its collections. It has approximately 10 million zoological and geological specimens.
The collections will be fused with the collections of the Zoölogisch Museum Amsterdam and expanded to approximately 37 million specimens. The fusion started in 2011 and is scheduled to be competed in 2012.
The collections are stored in a 60-meter-high tower, a landmark in Leiden, opened in April 1998.
Besides its temporary exhibition the museums has several permanent exhibitions: