Known as the Salt mine of Barletta, in 1879, the city changed its name and entitled to one of the most famous queens of Italy. It is an important thermal centre of the region and features a series of physiological saline baths, the most widespread in Europe, with unique multicolor effects.

Declared National natural Reserve in 1977, the marshes of Margherita di Savoia are of international interest thanks to the presence of cormorants and pink flamingo.

The Historic Museum preserves exhibits of the industrial periods: equipment and machines for the gathering, transportation and manufacture of the salt, weather and electric instrumentations and samples of the salt, that made S. Margherita so important in Europe, since III century b.C.