The Grande Arche de la Fraternité is a monument in the business district of La Défense to the west of Paris.
It is usually known as the Arche de la Défense or simply as La Grande Arche.

An international design competition was launched at the initiative of French president François Mitterrand. Danish architect Johann Otto von Spreckelsen (1929–1987) designed the winning entry to be a 20th century version of the Arc de Triomphe: a monument to humanity and humanitarian ideals rather than military victories.

The construction of the monument, which was undertaken, began in 1982. After Spreckelsen's death in 1987, his associate, French architect Paul Andreu, completed the work in 1989/90.

The Arche is almost a perfect cube (width: 108m, height: 110m, depth: 112m; it has been suggested that the structure looks like a four-dimensional hypercube (a tesseract) projected onto the three-dimensional world). It has a prestressed concrete frame covered with glass and Carrara marble from Italy and was built by the French civil engineering company Bouygues.

The nearly-completed Arche was inaugurated in July 1989, with grand military parades that marked the bicentenary of the French revolution. It completed the line of monuments that forms the Axe historique running through Paris. The Arche is turned at an angle of 6.33° on this axis however, a peculiarity which has been explained by several theories. In particular, the architect is said to have wanted to emphasise the depth of the monument, while the specific angle was chosen to create symmetry with the similarly-skewed Louvre at the other end of the Axe. However, it seems the most important reason was mundanely technical. With a métro station, an RER station, and a motorway all situated directly underneath the Arche, the angle was the only way to accommodate the structure's giant foundations.

In addition, the Arche is placed so that it forms a secondary axe (axis) with the two highest buildings in Paris, the Tour Eiffel and the Tour Montparnasse.

The two sides of the Arche house government offices. The roof section, exploited by Stephane Cherki, is an exhibition centre. The vertical structure visible in the photograph is the lift scaffolding. Impressive views of Paris are to be had from the lifts taking visitors to the roof.

To claim it as a virtual cache email me the number of the steps which lead up to the platform where the Arch stands. Alternatively send a photo of you and your GPS standing in front of the Arch.

© eisenstädter, Opencaching.de, CC-BY-NC-ND, as of 11/01/2016; all log entries © their authors