Discovery of hydrothermal systems on the ocean floor in the late 1970s is regarded as one of the greatest scientific discoveries of the 20th century and has implications for the flux of chemicals and heat into the oceans, the formation of some mineral deposits, and the origin of life. Over the last 50 years, deep-ocean hydrothermal vents have been found along plate boundaries throughout the oceans of the world.

Combine your visit to Gettysburg National Military Park this summer with a stop at the headquarters General Robert E. Lee used during the Battle of Gettysburg.

Efforts by Republicans in the U.S. House of Representatives to exact spending cuts in return for agreement to raise the nation's debt ceiling could have crippling impacts on the National Park Service.

National Park Service staff is working on a number of fronts to implement a White House directive to develop or restore and protect ecological corridors, including those relied upon by wildlife during their migrations.