1/ Information centre Kutná Hora - Sedlec
Kutná Hora has several information centres. The one in Sedlec is important for us, becuase you can buy here - besides many souvenirs and publications - the tickets to both cathedrals and the ossuary.
I definitely recommend buying a combined three-ticket pass to Sedlec Cathedral, the ossuary, and St. Barbara's Cathedral in Kutná Hora.
However, it is now also possible to purchase tickets online.