Pile of Rocks

Here's that old Roman Wall that runs through the middle of downtown London. This is near the Towe where it really comes out of the ground.
There's a pretty cool walking tour that takes you to 20-odd points around the City of London and has plaques telling you the history. By the way, the City of London is actually really tiny. Only something like a mile and a quarter a side. The rest of the Metro area is called the Greater London Authority, which except for about a decade in the 80's/90's has had it's own, autonomous government for a thousand years, since William the Conqueror in 1066.