r美国国家植物园建立于一九二七年，是美国农业部的科研和教育机构。植物园以培育推广改良的景观植物和开发新科技为手段来实现其服务公众和改善环境的宗旨。这里是公众科普教育的国家中心，并为前来游览的游客提供一个趣味盎然，赏心悦目的环境。 

植物园内的一座小山上有一组石柱，很吸引游人的目光。冷眼一看似乎是一座神殿类建筑的遗址，但美国似乎又没有那末古老。其实，这二十四根石柱是一九五八年国会大厦东翼扩建过程中，从其中央柱廊拆下来的。封存了十六年之后，于一九八四年才移到国家植物园立了起来。成为植物园一道独特的风景线。

国会大厦廊柱 （National Capitol Columns ）
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国家盆栽盆景博物馆，这个博物馆把日本的盆栽和中国的盆景艺术并列展览，让人们仔细地体会其异同。 

博物馆的入口处的影壁墙。
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