Campo San Barnaba is the square in Venice’s Dorsoduro district, beside the Church of San Barnaba.
 
Campo San Barnaba has a long history tied to Venice’s Dorsoduro district and the church that gives the square its name. A church existed on the site by the 9th century, but it was destroyed by fire in 1105, later rebuilt, and then transformed into its present neoclassical form in 1776 under Lorenzo Boschetti with support from the Grimani family.
 
The square grew up around the church and canal, becoming a local Venetian gathering place rather than a grand civic piazza. Its setting reflects everyday canal-side Venice, with the church at one side and small passageways and bridges feeding into it.
In the 18th century, the area was associated with the Barnabotti, impoverished noble families who lived nearby in reduced circumstances. That gave the place a curious reputation, since aristocrats were expected to maintain a noble appearance even when they had little money. Its where it gets its name.
 
Interesting facts...
It has a side entrance adjacent  to the Casin dei Nobili, an 18th-century gambling house for nobles. Oh and it is famous as a filming location for Indiana Jones and the Last Crusade.