Algiers vs Arch

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Algiers ( al-JEERZ; Arabic: الجزائر‎; Berber: Dzayer; French: Alger) is the capital and largest city of Algeria. The city's population at the 2008 Census was 2,988,145 and in 2011 was estimated to be around 3,500,000. An estimate puts the population of the larger metropolitan city to be around 5,000,000. Algiers is located on the Mediterranean Sea and at the north-central portion of Algeria.

Algiers is located on the west side of a bay of the Mediterranean Sea. The modern area of the town is built on the level ground by the seashore; the older part, the ancient city of the deys, climbs the steep hill behind the modern city and is crowned by the casbah or citadel, 122 metres (400 ft) above the sea. The casbah and the two quays form a triangle.

Source: Wikipedia

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An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaults, but a vault may be distinguished as a continuous arch forming a roof.

Arches appeared as early as the 2nd millennium BC in Mesopotamian brick architecture, and their systematic use started with the ancient Romans, who were the first to apply the technique to a wide range of structures.

Source: Wikipedia