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The National Mall: Contents Under Pressure

Over the past decade, the once-gleaming white marble dome of the Thomas Jefferson Memorial has taken on a decidedly undignified appearance. Creeping over the dome’s surface (as well as the monument’s signature columns and Greek-revival pediment) is a black substance known as biofilm, giving a grimy look to this monument to the third president.

To Boost Wireless Coverage, Yellowstone Proposes New Structure At Historic Lookout

After facing criticism for moving forward with a plan to boost wireless coverage in its vast landscape without proper historical preservation reviews and public involvement, Yellowstone National Park is accepting public comments on a proposed new structure that would surround three sides of the historic fire lookout atop Mount Washburn.