Alex Honnald has soloed Moonlight Buttress, Zion National Park.
http://www.alpinist.com/doc/web08s/newswire-alex-honnold-solo-moonlight
This has received little publicity, in contrast to many modern climbing spectaculars.
Moonlight Buttress is a classic grade V, 1200’ long, with many teams aiding the route over two days. It was first climbed in ’71 by Jeff Lowe and had its first free ascent in ’92 from Canadian Peter Croft and ex-pat Brit. Jonny Woodward. The meat of the free version is in final four pitches: three of 12a/b (solid E5) and one 12d (F7c or solid E6). This picture gives an idea of their situation:
http://www.alpinist.com/doc/ALP17/climbing-notes-wilder
In 2007, Honnald became only the third person to have soloed Yosemite’s Astroman. He also made free ascents of The Salathe wall and a one-day free ascent of Freerider, it’s easier variation.