Three, another thing that traveled along Mongol trade routes was cuisine. For example, it was because of the Mongols that rice became a staple of the Persian diet, which I mention entirely because I happen to like Persian food. Four, the Mongols forcibly relocated people who were useful to them, like artists and musicians and especially administrators. As you can imagine, the Mongols weren't much for administrative tasks, like keeping records, so they found people who were good at that stuff and just moved them around the empire. This created the kind of cross-cultural pollination that world historians these days get really excited about. And five, the Mongols were almost unprecedentedly tolerant of different religions. They themselves were shamanists, believing in nature spirits, but since their religion was tied to the land from which they came, they didn't expect new people to adopt it, and they didn't ask them to.