If one wishes to discuss actual trips to foreign lands by Chinese, trips on which some concrete understanding of the outside world was gained, one must look to the period after the Daoguang reign of the Qing dynasty, which is to say, to the last 200 years.
論起中國人真正到國外「旅遊」，對異國世界有具體的理解，還要到清代道光以後，也就是近兩百年的事。