In the center of Paris near Chatelet, this tower is located in a small parc and  is only accessible for visits 3 months in the year.

Every summer, Parisians get the chance to have a guided tour and, after a small climb, a panoramic view on all paris. Make sure to make a reservation online and arrive a few minutes before. 

Square de la Tour Saint Jacques : Paris Metro Chatelet

Details and reservations herewww.desmotsetdesarts.com