Are there any projects/experiments running for the observation of topological defects (domain walls, monopoles, etc)?
Are there any past/canceled or future such projects?
MoEDAL at CERN has survived since that time. This is about the magnetic monopoles. Domain walls may be too much stuff too wish for so I don't think that someone is looking for them and nothing else. Cosmic strings are being constantly looked for in the telescopes but so far, the bounds are tightening - they don't seem to be abundant (or they're totally absent).
There is a workshop on Axions, WIMPs and WISPs which will be held at Mykonos, Royal Myconian & Myconian Imperial Resorts on 26 June - 1 July 2011.