Abel's Buildings between Royal Mint Street and Chamber Street, London E1.

Abel's Buildings is very old, pre-dating the railway arches that run over it today. You can see an indication of the alleyway in this map from 1720 by John Senex:

http://mapco.net/senex/senex17.htm

It is specifically mentioned on this map from 1795 - Cary's New and Accurate Plan of London.

http://mapco.net/cary1795/cary22b.htm