Where had 13th-century Italian explorer Marco Polo journeyed by land that revealed rich trading possibilities?

Venice

Marco Polo had journey to Venice revealed rich trading activities; the city had grown to a maritime power which had gained reputation paving way for trading expeditions. Venice conducted intercontinental trade from the English channel to the Black sea at the European and Asian boarder and beyond. The city thrived as a port o exchange for goods and services with Mediterranean sea ports and served as a major port for Crusades to Palestine. Slaves, silk, pepper, dyes, furs, cotton, peacock-feathers, slaves, and timber were exported to Venice, whose merchants turned around and traded them to places across Europe.