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The nave is the central approach to the high altar, the main body of the church, in Romanesque and Gothic Christian abbey, cathedral basilica and church architecture. "Nave" was probably suggested by the keel shape of its vaulting. The nave of a church, whether Romanesque, Gothic or Classical, extends from the entry to the chancel and is flanked by lower aisles separated from the nave by an arcade.

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A church can be measured by various criteria in order to determine its size. Such measures include area, volume, length, width, height, or capacity. Several churches individually claim to be "the largest church", which may be due to any one of these criteria.

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From the Middle Ages until the advent of the skyscraper, Christian church buildings were often the world's tallest buildings. From 1311, when the spire of Lincoln Cathedral surpassed the height of the Great Pyramid of Giza, until the Washington Monument was completed in 1884, a succession of church buildings held this title.

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The designation of the oldest church in the United States requires careful use of definitions, and must be divided into two parts, the oldest in the sense of oldest surviving building, and the oldest in the sense of oldest Christian church congregation. There is a distinction between old church buildings that have been in continuous use as churches, and those that have been converted to other purposes; and between buildings that have been in continuous use as churches and those that were shuttered for many decades.

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This is a list of the largest Eastern Orthodox church buildings in the world, based on area and capacity. Any Eastern Orthodox church building that has a capacity of 3,000 people or more, can be added to this page. Entries are included even if they currently do not function as a church. For example, the Hagia Sophia is included – it was originally built as a church but was later converted into a mosque. Sorting is done by volume (priority) and area. The church building are listed in alphabetical order according to country. The churches are from various jurisdictions of the Eastern Orthodox Church.

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This is a list of tallest Orthodox church buildings in the world, all those higher than 70 metres.

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This is a list of the largest Protestant denominations. It aims to include sizable Protestant communions, federations, alliances, councils, fellowships, and other denominational organisations in the world and provides information regarding the membership thereof. The list is inevitably partial and generally based on claims by the denominations themselves. The numbers should therefore be considered approximate. Protestant bodies being considered in this article are divided into:transdenominational bodies with more than 50 million members international bodies with more than 10 million members national bodies with more than 5 million members non-national bodies with more than 5 million members