The Oculus Rift has finally reached the market and I had the luck of getting my hands on a set and showing it to the office. Getting to wear one is truly an amazing experience. Imagine being able to stand toe-to-toe with an alien, face-to-face with a T-Rex, or towering over a miniature cityscape, in each case feeling like you'd be able to just reach out your hand and touch them.
This is what it takes to get one:
I understand that that's a pretty steep cost for most people and most libraries, but if you could swing it I bet you'd be able to garner the attention of quite a few teens and young adults.
There are cheaper, less robust, options out there as well; namely Google Cardboard. Google Cardboard is most simply a mount with lenses that can turn most any smartphone into a pair of VR goggles. The base "cardboard" set is only $15, and there's many other more structural options as well for various prices. Phones are not included, however.
Very similar to Cardboard, but a little more cleaned up and more expensive, is the Samsung Gear VR. The headset is $99 and requires a Samsung Galaxy S6, S7, or Note 5 to use it.