|"Jewel Rock", upheld by pinnacles in the amphitheater at Red Mountain|
The amphitheater at Red Mountain on the Coconino National Forest northwest of Flagstaff, Arizona is a perfect example.
Red Mountain is a 1,000 foot tall cinder cone volcano created from a fiery crack in the earth about a million years ago. Some time later, its northeast flank blew out in another explosion, and its exposed innards have eroded into weird and wonderful pinnacles called "hoodoos".
In this photo, a harder boulder came to rest upon relatively softer material, which seem to be holding it up to the sky. It's like a diamond in its setting on a ring.