The nation's capital was laid out on a low coastal plain with gentle topography, but it's still a fascinating place to see stones. The demands of prestige, politics and bureaucracy have ensured that Washington is made of the finest stone from many places, mostly American. Thus geologists, no matter where they come from, are likely to find familiar friends in Washington even if they don't know a soul in town. Tourists will enjoy the U.S. Geological Survey's friendly guide, "Building Stones of Our Nation's Capital." Serious geo-tourists will want to consult a field-trip guide by the Geological Society of Washington (which also has materials about the Potomac River valley near Washington).
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