National Mall Washington DC from Hirschhorn building. The red sculpture in front is Are Years What? (for Marianne Moore) (1967) Mark di Suvero.
The building with the dome is the National Museum of Natural History.
The National Mall is connecting buildings and symbols of political power, Capitol, Washington monument, White house, etc.
The National Park Service states that the purposes of the National Mall are to:
Provide a monumental, dignified, and symbolic setting for the governmental structures, museums and national memorials as first delineated by the L’Enfant plan and further outlined in the McMillan plan. (https://en.wikipedia.org/wiki/National_Mall#L’Enfant_City_Plan) Foundation statement for the National Mall and Pennsylvania Avenue National Historic Park (PDF). National Mall Plan. National Park Service. pp. 6–10. Archived from the original
The sculptures and musea are part of this political/power structures on the Nat. Mall.