The top picture was taken at the Gosbecks archaeology park, so it's not your average flat Essex field. Look carefully and you can see some diagonal marks in the grass. These show the outline of the vomitory of a Roman-celtic theatre that stood on this spot. (Note: this is an alternative meaning to the word vomitory, not to be confused with the vocabulary associated with contemporary late night excessive drinking events.) All that's left to see of this 270 feet diameter Roman theatre is a D-shaped mound. All the stone and timber has disappeared.
Imagine this scene nearly 2000 years ago. Hundreds of Romans and Britons milling around, waiting for the show. We walk a few paces forwards and we enter between the pillars of the gate, and pass under the upper tiers of the several thousand seats. The feint horizontal lines show where the rows of seats were. Ahead of us is the plain stage, (in the middle distance of the photograph), probably walled at the back. Around the theatre, a range of buildings, including a massive temple. Nearby maybe a horsefair and marketplace. Just to our right, the palace of King Cunobelin, now unmarked above ground.
And here is the River Blackwater estuary taken from the Monkey Beach at West Mersea. The low land on the horizon is the Dengie peninsular; even now, remote and sparsely populated. In the centre of our horizon are a few trees, and the site of Othona. This was a Roman fort of the Saxon Shore, only a short low section of wall now being visible, and most of the site eroded away by the sea over the last 1800 years. In AD 653 St Cedd arived by boat from the north east of England, and founded Britain's oldest surviving church, now known as St Peter's on the Wall, Bradwell on Sea. http://www.bradwellchapel.org/ He built his Christian church on the foundations of a ruined Roman fort gateway. I challenge even the staunchest atheist not to be moved on entering this ancient building, in a silent corner of the Essex marshes.
Essex may be flat in parts, but it certainly isn't boring. A pair of walking shoes, and an imagination, and it becomes a time machine. Hope you enjoyed our journey.