Place Plumereau: The main attraction in Tours, is in and around where the old town (vieille ville or 'le Vieux Tours') is found. Place Plumereau is also a great place to sit at one of the cafes and enjoy people-watching.
View along the river in Tours: There are also a number of splendid and grand houses dating from the Renaissance period found in this part of the town.
The Cathedral Saint-Gatien: is centrally placed, and contains the tombs of the children of Charles VIII. Most notable, although part of the cathedral dates from the 12th century, is so-called 'flamboyant gothic' style.
The cloisters of la Psalette: An impressive structure in a mix of architectural styles with elaborate stonework and a beautiful renaissance staircase. In part of the cloisters you can see the room where religious chanting was practiced.
The Museum of Fine Arts: housed in the Archbishops Palace. There is also a cedar tree in the garden of the Archbishops palace, famous for being planted by Napoleon.
Source: http://www.francethisway.com/