President Barack Obama wants more people to appreciate and visit America's national parks as the park system nears its 100th birthday in August. Obama and his family spent the night at Yosemite National Park in California after touring an underground cave on Friday at Carlsbad Caverns National Park in New Mexico. The president then gave a rousing speech at Yosemite that urged Americans to "get out into the great outdoors." He tapped Congress, thanking them for working to protect the parks.