Along the National Mall in Washington, D.C., memorials honor the service of Americans in wartime, but the site’s newest addition will be one that fosters conflict resolution and peace. The 150,000-sq-ft permanent headquarters for the U.S. Institute of Peace, being built at the mall’s northwest corner near the Lincoln Memorial and the Theodore Roosevelt Bridge over the Potomac river, will greet visitors with a dramatic new structure that its designers say both respects the context of its historic surroundings and offers a strikingly modern contrast. Slide Show Photo: The U.S. Institute of Peace. The 150,000-sq-ft U. S. Institute of Peace,
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.