What about the new Skywalk at the Grand Canyon, Arizona ? A glass pathway built as a horseshoe 1100m above the Colorado River. The emptiness directly below your feet is only about 200m, though.
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| The environemental aspect of this is questionable, but at least it brings extra income to the native-american tribe that is operating it. |
In any case, hard to beat the Leukerbader Klettersteig in switzerland, where, right after coming out of a vertical cave, you will end up with 1000m of void right under your foot! Been there, done that :-)
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