I started a ‘virtual’ Geocache set at the top of st. Paul’s Cathedral in London back in 2004. In that time I’ve seen some awesome photos but no one has ever gone back almost 30 years to claim the cache and provide an amazing perspective on London’s changing skyline. Definitely worth checking out:
http://www.geocaching.com/seek/log.aspx?LUID=e98563ce-9e85-421d-81da-a274b914af5c
I don’t think you need to login or register to see them, but if you do, the logger has provided a flickr link to the photos here:
http://www.flickr.com/photos/roderickparks/5034669036/in/set-72157602121750074/
Not only did they go back in time to 1987 to claim the cache, this is also one of the few Virtual caches with a terrain difficulty of 3 out of 5.
Neat!