On the 17th of May La Nuit des musées- the Night of the Museums is on. Some 2000 different museums all over Europe will stay open during night with special events and lots of fun.
The centre of attention should be pointed towards France where it all started. Visit Paris, Toulouse, Dijon, Bordeaux or Cannes. The museums will stay open from dusk until 1 am and there will be free entrance!

Have a look at the website La Nuit des museés to see where the fun is at.
Maybe something cool is happening in your town?