Sony FDR-AX 100B 4K. Filmed April 30, 2014 on Kampa Island, Prague. For best 4K experience, view on YouTube at 1440P. May Day is a very important holiday in the Czech Republic. On April 30th, cities and villages across the country burn a witch. It’s lots of fun for kids and parents. Now the witch is straw, not so in pagan times. This witch burning was sponsored by the City Police on Kampa Island.