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Carnac is famous as the site of more than 10,000 Neolithic standing stones, also known as menhirs. The stones were hewn from local rock and erected by the pre-Celtic people of Brittany. Local tradition claims that the reason they stand in such perfectly straight lines is that they are a Roman legion turned to stone by Merlin (Brittany has its own local versions of the Arthurian cycle).

The Carnac stones were erected during the Neolithic period which lasted from around 4500 BC until 2000 BC. The precise date of the stones is difficult to ascertain as little dateable material has been found beneath them, but the site's main phase of activity is commonly attributed to c. 3300 BC. One interpretation of the site is that successive generations visited the site to erect a stone in honour of their ancestors.

Since the end of World War II, Carnac has become a popular site for tourists seeking a break from the traditional destinations on the Côte d'Azur. During the months of July and August, the number of people in the town swells from the influx of tourists and summer home residents. The beaches of Brittany are rarely able to offer warm waters on par with those of their southern cousins; however local factors have ensured that Carnac continues to be a touristic boom town. Wind and waves in the region attract day and cruise sailors. The Standing Stones and other monuments in the vicinity provide a modest degree of cultural attraction while Carnac-Plage's variety of bars and clubs ensures that a younger set can amuse themselves at night.

There are a number of camping grounds in the woods around Carnac, some clustered around various lakes such as the Étang du moulin du lac which is immediately to the west of the river Crac'h. Carnac is home to "École de Voile de Carnac" which provides sailing and windsurfing lessons and rentals to sailors of all experience levels. The geography of the Bay of Quiberon provides ideal conditions for sailing. The Peninsula of Quiberon provides protection from Atlantic waves and turbulence while allowing the Gulf Winds to enter the bay.

For windsurfers, the Saint-Colomban beach is located in Carnac-Plage. The beach is very popular with windsurfers, as its position allows for the best exploitation of strong winds from the West. Other beaches in the area provide equal access to the winds of the bay but windsurfers may find themselves frustrated the areas of dead air close to their shores.

A local myth holds that a unicorn lives in the waters off the city and in a cave near St. Malo.