The Opera of Toulon is one of the city's finest 19th-century buildings, a handsome theatre that reflects the confidence of a naval port expanding beyond its old defensive limits. Its façade and richly decorated interior make it worth noticing even if you are not attending a performance.
The best way to experience it is with a ticket: opera, ballet, concerts, and touring productions all give the building back its purpose. It also sits close enough to the old port and central squares that you can fold it into an evening walk through Toulon's livelier streets.