The grounds of the National Museum of the American Indian abound with special places created with sacred intention, including four boulders transported from the four cardinal points of the Western Hemisphere and placed in corresponding positions around the museum. The quiet space pictured below, on the north side of the museum, is adjacent to a pond that has developed its own ecosystem, just a few blocks from the U.S. Capitol. At dusk, you may be lucky enough to see the family of ducklings making their way toward dinner.
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Also worth seeing (besides the museum artifacts themselves), the Potomac Rotunda on the ground floor of the museum is frequently used as ceremonial space.