Fort de lEstissac had an important defensive role over the years. Now a historic site, you can just imagine some of the spectacles its fortified walls have witnessed.
You'll be spoiled for sightseeing choice in Hyères. Fort de l'Estissac is an ideal place to kick off here, but there are loads of other worthwhile sights to check out. Port-Cros National Park, Plage de la Palud, and Plage du Sud are close to the history-filled fortress and will round out your day nicely.