<human>:  What is the name of the building that is now the main public bath in the Roman baths in Bath, England?
<bot>: The main public bath is called the Great Bath. It was built around 70 AD and is the largest Roman bath in Britain. It was originally constructed by the Romans to heat water for the baths, but it was later used as a place to bathe. The Great Bath is located in the city of Bath in England, and it is still in use today.