Trolltunga - Norway, while I'd never sit on the edge of that thing, it would be awesome to see! From an appropriate, safe and respectful distance!
The Romanian Sphinx, Bucegi Mountains, Romania. The Romanian Sphinx of the Bucegi Mountains is a rock shaped by wind and other natural phenomena.
'The World's Scariest Roads' - Grossglockner High Alpine Road, Austria. Only open in the summer - as snow blocks it from late October to June.