The Toblerone line is a 10-km long defensive line made of dragon's teeth

Dragon's teeth (fortification)

Dragon's teeth are square-pyramidal fortifications of reinforced concrete first used during the Second World War to impede the movement of tanks and mechanised infantry...

 that was built during the second World War

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 between Bassins and Prangins

Prangins

Prangins is a municipality in the district of Nyon in the canton of Vaud in Switzerland. It is located on Lake Geneva.-Geography:Prangins has an area, , of . Of this area, or 54.7% is used for agricultural purposes, while or 13.1% is forested...

, in the Canton of Vaud

Vaud

Vaud is one of the 26 cantons of Switzerland and is located in Romandy, the French-speaking southwestern part of the country. The capital is Lausanne. The name of the Canton in Switzerland's other languages are Vaud in Italian , Waadt in German , and Vad in Romansh.-History:Along the lakes,...

, Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

. These lines of defensive blocks can be found all over Switzerland, but more predominantly in border areas. Their purpose was to stop tank

Tank

A tank is a tracked, armoured fighting vehicle designed for front-line combat which combines operational mobility, tactical offensive, and defensive capabilities...

 invasions. The 2,700 9-ton concrete

Concrete

Concrete is a composite construction material, composed of cement and other cementitious materials such as fly ash and slag cement, aggregate , water and chemical admixtures.The word concrete comes from the Latin word...

 blocks that make up the defences are similar to the shape of the chocolate bar "Toblerone

Toblerone

Toblerone is a chocolate bar brand owned by Kraft Foods, who acquired the product from former owner Jacobs Suchard in 1990. It is well-known for its distinctive packaging, its prism shape and its ubiquity in duty-free shops.The triangular shape of the Matterhorn in the Swiss Alps is commonly...

", which gave its name to the line. Since the line has been left to nature since its construction, it was decided to keep these concrete blocks and to make a hiking trail along their route.

The line was built along twelve fortresses, the most well known being the "Villa Rose" in Gland

Gland, Switzerland

Gland is a municipality in the district of Nyon in the canton of Vaud in Switzerland.-History:Gland is known to have been a prehistoric settlement. During the Roman period a farm called Villa Glanis was there...

, which was transformed into a museum and opened to the public in 2006.