The Antique Theatre (Le Théatre antique)

 

Although it is on the site (approximately) of the original, the present day structure is almost totally a 19th century reconstruction and has recently been aggressively transformed into a venue for pop concerts. You can see some original bits and pieces perfectly well through the railing along the side of the Jardin d’Eté or along the side of the Rue du Cloître without paying an entrance fee. If you buy a billet global (sort of combined entrance ticket to most of the sites) then it is included but if you haven’t, it is debatable whether it is worth paying for a visit.