Chichu Art Museum by Tadao Ando concrete staircase.

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Walter De Maria's 2004 Time/Timeless/No Time sits within a grand subterranean hall, its gleaming surface reflective the sunlight from above. When the sun sets, the space becomes far darker and the sculptures more mysterious.

Photo Courtesy 準建築人手札網站 Forgemind ArchiMedia via flikr.