Every region has its own culture and burial practices. To find out more about this area's beliefs on life after death, spend some time at Kūkai Mausoleum.
You'll have sightseeing choices galore when staying in Koya. Kūkai Mausoleum is an ideal place to start here, but there are loads of other fine spots to consider. Mount Koyasan, Muryokoin Temple, and Kongobuji Temple are not far from the tomb site and will round out your day nicely.