Ruby Dome. The Rubies are something I always plan to do, but never actually end up doing.
Because I'm a dorky hiker, I'm obligated to point out that the Ruby Crest Trail is a National Recreation Trail, not a National Scenic Trail. NST's are individually designated by an act of Congress and there are only 11 of them (AT, PCT, CDT, Pacific Northwest, Arizona, Florida, Natchez Trace, New England, Ice Age, North Country, Potomac Heritage).
By contrast, the Secretary of the Interior has the authority to designate National Recreation Trails. There are dozens (hundreds?) of them.