There is this legendary stone at 111 Cannon St. in London that is in a curbside cage set in a building..It's really hard to find..I walked past it once and almost gave up...but I found it!
There are so many legendary stories attached to this stone..one of them is that it was part of an altar built by Brutus the Trojan and there's a proverb that says, "So long as the stone of Brutus is safe, so long shall London flourish."
It is also said the the ancient stone is in the place that the Romans measured all distances in Great Britain..Charing Cross is now the place from which all distances are measured..
Whether all this is true or not, I sure like a legend or two..it's kinda fanciful and romantic...I recommend you to go find this stone..lol..and then go further down the street to the London Stone Pub with its gothic decor and have a pint or two..