The great thing about neutrinos is that they are so weird—almost massless, loath to interact with other particles, prone to switch identities from one moment to the next. And their weirdness, if we could explain it, promises to expand our understanding of the physical world. The not-so-great thing about neutrinos is that they are difficult to study.
They interact so rarely with ordinary matter that physicists must erect giant detectors so that, eventually, one of the myriad neutrinos passing through will bump up against an atom in the detector. Often these experiments require deep underground locations to screen out cosmic-ray particles. Alternately, experimentalists can set up shop next to prodigious sources of neutrinos, such as nuclear reactors.
Take a tour of some of the intricate experiments (and their exotic locales) on the leading edge of neutrino physics in this slide show.