Walls have been built since ancient times, to mark borders, protect kingdoms and settlements, or keep out unwanted people. In more recent times, walls have also been built to serve as memorials and structures of art.
# Chewing Gum Wall, Seattle, USNot all walls are controversial and divisive. Seattle's gum wall is the place for any unwanted chewing gum, a tradition which was started by people queuing for the theatre. Currently the gum on the wall stretches to several inches thick and is a slightly alternative location for wedding photographs.
# Storm King Wall, NY, USAndy Goldsworthy (British sculptor, photographer and environmentalist) created the Storm King Wall in Mountainville, New York in 1997. At 2,278 feet (694m) long, the site-specific sculpture is made from stones gathered around the Storm King Art Center’s property.
# Security Wall, West Bank, IsraelThis wall is the most controversial in the world. It is being constructed by the Israeli government to separate the Israeli and Palestinian people of the West Bank. Currently standing at 8m (26ft) high, this wall remains a source of hostility and resentment between the two peoples.
# Vietnam War Memorial Wall, Washington D.C., US
The Vietnam Veterans Memorial is a national war memorial in Washington, D.C. It is often described as the most moving memorial in the city, the Vietnam Memorial stands as tribute to those who died or went missing, intended to transcend political controversy in remembrance of the soldiers who gave the ultimate sacrifice. Its centerpiece, the Memorial Wall designed by Maya Lin, is made up of two black granite walls engraved with the 58,256 names of the soldiers.
# Belfast Peace Line, Belfast, Northern IrelandThe Peace Line stands over 20ft (6m) high and was constructed to separate Catholic and Protestant communities in Belfast thereby 'keeping the peace'. What was meant as a temporary measure became more permanent as the barriers became longer and wider. The recent suggestion that they should be destroyed was met with anger from local residents and so its deconstruction remains a debated topic.
# Green Line Walls, CyprusIn downtown Nicosia, the Green Line is made mostly of big, colored oil barrels; as you walk along, these yield to bulldozered bunkers with thick green overgrowth. The term Green Line refers to the cease fire line that de facto divides the island nation of Cyprus into two, cutting through the capital of Nicosia. It was first established in 1964.