June 8 is the 100th anniversary of the Antiquities Act, an obscure law adopted by Congress in 1906, giving the president authority to permanently reserve as national monuments federal sites with significant prehistoric, historic, or natural features. Beginning with Theodore Roosevelt, presidents have used the act to protect more than 160 of America's best-known and beloved landscapes. To read U.S. Representative Raul Grijalva's full comments about the history and importance of the Antiquities Act,
click here.