The city developed on the homonymous cape and is separated from the island of Elba by the Channel of Piombino. The top of the cape is occupied by a square, from which - when the sky is clear - you can see the Archipelago Toscano and also Corsica.
In the historical center of the city there are numerous architectonic monuments, as an example the Tower (1212), the ancient door of the city, only token of the communal age, also known as door of Sant' Antonio, and the Rivellino, (1447) a fortification of Tower, with semicircular shape, built to better defend the city from the artilleries.
Moreover, it's worthy a visit the Concattedrale di Sant'Antimo (1377) and the annexed cloister, built in 1470.
The church of Sant'Antimo, once dedicated to San Michele, then to Sant'Agostino, has a simple façade made of bricks (the mosaic on the door is dated 1937). The interior keeps some of the valuable works of Andrea Guardi: the baptismal font (1470) with crests of Appiani, an important noble family of the city, the holy water stoup that leans on an Etruscan cippus dated back to the V century b.C., the funeral monument of Emanuele and Fiammetta, sons of Iacopo III Appiani.