As we all know All the Antiquities were constructed well before there was any such notion of political boundries. Silbury, Stonehenge etc' is as English as Callanish or the Ring of Brodgar.
To be peculiarly English it would need to be from the period of the Norman Invasion to the Union on the Nations.
I suggest The Tower of London, or how about Holbein's portrait of 'Enery the 'Aitff?