
For the third straight year, the Lincoln Memorial on the Mall was the most visited of the monuments and memorials in Washington in 2011. The memorial to the 16th president drew an estimated 6 million visitors that year, according to the National Park Service. (Associated Press)

National Park Service rangers use high-powered leaf blowers to remove fresh snow from the walking bridge leading to Theodore Roosevelt island, in Washington, D.C., Thursday, Jan. 24, 2013.(Andrew S. Geraci/The Washington Times)

Allan Stewert, a D.C. resident, walks his dog, Bobo, down he walking bridge leading to Theodore Roosevelt Island as National Park Service rangers use high-powered leaf blowers to remove fresh snow from it, in Washington, D.C., Thursday, Jan. 24, 2013. (Andrew S. Geraci/The Washington Times)

As many as 1,200 nature lovers a day have been climbing Half Dome at Yosemite National Park. A limit of 300 has been set to avoid traffic jams, especially when bad weather hits the dome that rises 5,000 feet above the valley. (National Park Service via Associated Press)

As many as 1,200 nature lovers a day have been climbing Half Dome at Yosemite National Park. A limit of 300 has been set to avoid traffic jams, especially when bad weather hits the dome that rises 5,000 feet above the valley. (National Park Service via Associated Press)

Ray Emory was determined to have the grave markers of Pearl Harbor’s unknown dead include at least the name of their ship, even if their names remain unknown. He kept pressing the government until it was done, and on Dec. 7, the Navy and National Park Service will honor him for his effort. (Associated Press)

Ray Emory was determined to have the grave markers of Pearl Harbor’s unknown dead include at least the name of their ship, even if their names remain unknown. He kept pressing the government until it was done, and on Dec. 7, the Navy and National Park Service will honor him for his effort. (Associated Press)

National Park Service volunteer Kimberly Saucedo-Broach,16, chats with World War II veteran US Navy Coxwain (Retired) Barney Melvin, of Shelbyville, Ill., (right) during the Veterans Day at the National World War II Memorial event in Washington, D.C. (Rod Lamkey Jr./The Washington Times)

Left to right: Andy Dimitriou of Chicago, Ill., Judy Franklin of Las Vegas, Nev., her sister Janice Hoffman of Chicago, Ill., and Michael Franklin of Las Vegas, Nev. walks up to a temporary barrier to get a close up look at the closed National Monument as the National Park Service announces that Perini Management Services, Inc. of Framingham, Mass. will be the contractor tasked with repairing the earthquake damage to the Washington Monument at a press conference, Washington, D.C., Wednesday, September 26, 2012. (Andrew Harnik/The Washington Times)