However , many of the present day historic buildings in the main streets of the town are from 16th to 18th century .
The basic layout of the town below the Abbey is dated to the 11th and 12th centuries .
Many of the present day historic buildings in the main streets of the town are from 16th to 18th century .
The basic layout of the town below the Abbey is dated to the 11th and 12th centuries .