Torcello is an island on the northern Venice Lagoon. It is almost uninhabitated and it’s part of the “tour of the islands” together with Murano and Burano. It doesn’t have much to offer, but it’s a beautiful place full of art and history and it is really worth a visit.
Torcello is considered to be the island from which the people who founded Venice came from. According to history Torcello was first settled in the year 452 and it had a cathedral way before St Mark’s cathedral in Venice was built. However, there are traces that say that the island was already inhabitated in the 1st century when the nearby roman town of Altinuum (known today as Quarto d'Altino) on the mainland was one of the most important commercial ports of northeastern Italy.
ACTV ferries (vaporetto) across the lagoon from Burano. Otherwise you'll need to book one of the many "tour of the islands" departing from Venice, but you'll need to do your own research to find the good ones with good English-speaking guides.
Torcello is really small, you just need to walk along the canals and streets.
The only place where you can sleep is the famous Locanda Cipriani, expensive. You will more likely spend just a few hours in Torcello before returning to Venice or other nearby places.