I have to saythat I’m completely in agreement with Cee when it comes not only to horizons but also other horizontal lines actually being horizontal; I use the Straighten Tool in Lightroom to correct my own errors – as far as possible.
Oradour-sur-Glane, with the Monts de Blond in the background.
Some other images featuring strong horizontal lines:
The sandstone from which is carved the many colossal monuments at Petra
Bottles of champagne waiting for their time to come in the cellars at Epernay
The ceiling of one of the chapels in St Mary’s Church, Beverley
Headquarters of the Abu Dhabi Investment Authority in Abu Dhabi. I can see my old office…
Finally, a couple of other images with multiple horizons:
An old wooden fence marks a field boundary; about half a mile from here.
From Greywalls Hotel, a view across Muirfield Golf Course to the Firth of Forth and the Kingdom of Fife