This is an oldie but goodie of the outside of the newish Indian Museum on the National Mall in Washington, D.C. (by the way, currently closed as a result of the government shutdown). From the back, the museum, which seems to fit in with none of its Smithsonian neighbors, looks like a hunk of sandstone. From the front, it is a work of art. I have seen it described as a “wind-sculpted rock formation.” The wind-sculpted front sneaks up on you. I love the curves, lines, and textures.