Samantha S.
Yelp
One of the geekier options for fun in Leiden, the Boerhaave Museum is a fascinating stop for anyone who's interested in history, science, medicine, or any combination of those.
It's a national museum, so it's been curated at a very high level. The space itself is in an old building, but one that's been renovated perfectly to show off the items and explain their context. The collection ranges from the 16th century to the present.
Not being science-oriented myself, I'll say that the earliest items are the most accessible. The closer you get to the present, the more complicated and specialized everything becomes. Eventually, all the items look like interchangeable metal boxes. But that's just me. If you're at all knowledgeable, I'm sure they're more compelling.
The first thing you encounter is a replica of the 17th-century anatomy theater. You can set in the seats and imagine what it would have been like to attend a dissection, at a time when very few people understood the human body at all. This showpiece is surrounded by skeletons (animal and human) and explained by a video.
The early medical instruments were also cool (and creepy). Tracing the history of familiar instruments like microscopes and clocks is also interesting, and there are some hands-on displays that help you understand the scientific principles behind them. The natural history collections are amazing and daunting (like an 18th-century version of "Hoarders.")
I wish there was an audio guide to help explain the significance of some of the more arcane exhibits. Apart from that, though, this museum is an intellectual treat of the first order.