return of the what

[totient]

What's this?

Answer in the comments.

Comments

[qwrrty.livejournal.com]

Is it the whale pier bridge over the Moselle?

[palmwiz.livejournal.com]

Precisely. Congratulations also to scliff, fraterrisus, foms, drbitch, and anyone who figures it out before clicking through to see this comment. Apparently there are some other whale pier bridges (http://en.wikipedia.org/wiki/Mulberry_Harbour#Whale) but this one seemed to be a good difficulty (and in fact just about exactly half of you got it, which is what I usually aim for).