I went to a place where they did that when I was younger. We were visiting a monastery and were told to be respectful because there was a sky burial going on while we were there. We decided to just look around but to keep away from the ceremony. I was really out of it with altitude sickness so I was just sitting looking down at this gorgeous valley near the bus, while the people I was with went to look around the monastery. Then I could see all these vultures flying away with little bits of meat. Very surreal experience.