Unknown to many, the Archway Bridge, sometimes also known under the sad name of "Suicide Bridge" offers not only a swift passage to the afterlife, but also a wonderful view of London.
The Bridge itself, a Grade II listed structure was built between 1897 and 1900 to replace the original Archway Bridge. Designed by Sir Alexander Binnie, the cast iron bridge has segmental-arched span of 120 feet and stretches about 80 feet above the A1 trunk road. Over the years several safety measures have been implemented in attempt to prevent people from jumping. As these appear not to have been efficient, introducing further measures including safety nets is currently being discussed.
You are looking for a small magnetic container, roughly the size of a 35 mm film canister.
And don't forget to enjoy the view ;)
Please note that in order to find the cache, you do not need to lean over the railings!
Congratulations to SirGooch for being the FTF