The last museum I've visited is the Rijksmuseum van oudheden (Rapenburg 28, Leiden). It contains statues, glasses and other object from the antiquity. The main cultures present are Romans, Greeks and Egyptians. There is also object from Iraq and Syria as well as India.
The museum is divided in two floors. The first floor is dedicated to Romans, specially in the area of The Netherkands; to Greeks, including statues and pottery; Middle Orient, mainly Syria and Iraq, including transparent and colored glass, statues and cuneiform scripts. There were also a big area containing different sorts of swords, from Romans to XIX century and weapons from Indonesia and other countries from the south east of Asia. Some of them were really impressive and massive, difficult to imagine an actual use for them.
The second floor has a big room for the history of The Netherlands in the Middle Ages. There is a great collection of pottery, statues, daily life tools (some of them are jewels) and even clothes or boats. There is also fossils from animals and humans. In this floor, there is another room dedicated to Greeks, with a focus on the pottery, hundreds of painted pots representing the life of Greeks, gods, etc. And statues from burials and gods.
If you like History and ancient objects, this is a must-seen in Leiden. The visit can take about 2 hours or more if you read everything about each object and the culture it is from. They count with mummies, sarcophagus and a big temple in the hall, so you'll be impressed from the beginning.