If you've never been to Washington, D.C. before, plan to spend some time along the Tidal Basin, an approximately 107-acre pond encircled by a 2.1-mile loop trail. Constructed to use the strong ...

The 75.47-carat Hooker Emerald was worn by Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire. Photo by Chip Clark, courtesy Smithsonian Institution, National Museum of Natural ...

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