Four-century see-saw

This is London Bridge in 1616, in a famous engraving by Claes Janz Visscher.  If you look at the lower right hand corner, you'll see heads on spikes, a little public service announcement for people considering treason. (Click on the picture, if you must.)

And this is the same scene in 2016, drawn by artist Robin Richards.

If you go here, you can spend hours of fun, sliding back and forth between two years that are four centuries apart.

Not me, though. I'm going to bed.