Possible Clues:

• Region in Venice and in Dublin
• Central area of Venice and suburb of Dublin
• Italian bridge books returned by rail, mistakenly
• It's associated with bridge in tutorial topics
• Venice area with famous bridge
• Name of many an historic theater
• The business district of Venice, known for its bridge over the Grand Canal
• Venetian bridge over the Grand Canal
• Head from court case over to business centre
• Region in Venice and Dublin