If you really wanted to climb to the top of Half Dome in Yosemite National Park this year, your window is about to be closed (unless you're an experienced climber).
That's because the cables that make it easier to ascend to the top of the dome are scheduled to be taken down Tuesday. The cables are taken down each October for the fall and winter season so snows and ice don't ruin them. The cables will be put back up in the spring of 2011 as conditions permit.
Visitors are strongly advised by park officials against attempting to summit Half Dome without the cables in place as the dome can be extremely slippery and may be wet and/or icy even in seemingly dry conditions.