Half Dome

Half Dome is one of the biggest rock formations in Yosemite. It's known for the free solo ascent by Alex Honnold (pictured below.)

Alex Honnold Free Soloing

Any climber knows about Honnold's free soloing - it's terrifying but these pictures are amazing. He made the first free solos of the largest walls in North America. He will climb up 2,000 feet with no harnesses or ropes. 

Watch these videos and try not be jealous of how calm he is -
Free soloing an 11
Free Soloing in Yosemite