21.   The engineering feat would be equivalent to sliding the White House across Pennsylvania Avenue, or shoving the Sphinx over a bit to make room for another Egyptian pyramid.

22.   While the politics and economics behind the bridge may be questionable, nothing can detract from what is a superb engineering feat.

23.   One major engineering feat was to divert part of the river so that a tunnel could be laid in central Berlin near the proposed new central railway station.