Anyone who travels through Gatwick has probably seen the overbridge
that connects the North Terminal to its pier 6. This is the world's
highest and longest passenger bridge over an active taxiway, and I
think it's rather elegant.

It opened in 2005, and was designed to be high enough for the
then-largest aircraft using Gatwick, the 747-400, to pass underneath.
The only other such airbridge over a taxiway (in Denver) is much
smaller, only being high enough for 737s to pass underneath. Of
course, Gatwick North Terminal now sees regular A380s, which are
slightly too high to pass under the bridge, while no 747s currently
serve the North Terminal (which will soon change, as Virgin is moving
to it).

I happened to pass over and under it last month, possibly for the last
time in a while, as BA is moving back to the South Terminal, so I took
some pictures:
https://www.flickr.com/photos/reclin...57675681821364

There's more about its construction he
http://www.ingenia.org.uk/Content/in...21/samaras.pdf