The purpose of the museum is to display and provide history of America's architecture, engineering, and construction of buildings and designs. The museum includes a variety of exhibits.
The National Building Museum is located at 401 F Street NW in Washington, D.C., United States. It is a museum of "architecture, design, engineering, construction, and urban planning" It hosts exhibits as well as interactive activities for various ages.
I believe you already got your answer it is all about the architecture and Design.
The building was initially built after the civil war to house the pension bureau. It became a museum in 1980
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