Caernarfon Castle (part of!)

Lesson 1.
You can't go on a group outing and expect all the non-photographers to wait 3 hours until the sun moves just a little bit more and shadows to dissapear.

Lesson 2.
Old buildings were never built 'striaght', or if they were, a few hundred years soon gives them a wobble. Hence, no mater how many attempts you make, something will always look askew.

Lesson 3.
Work harder, earn more money, buy wider lenses.