Ron,
I am not a lawyer and these are my interpretations of what I have studied in copyright law.
1. Wikipedia defines landscape as:
Quote:
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A landscape comprises the visible features of an area of land, including physical elements such as landforms, living elements of flora and fauna, abstract elements such as lighting and weather conditions, and human elements, for instance human activity or the built environment.
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Whether or not a man-made sculpted landscape is considered a work of art is subject to interpretation.
2. Yes
3. The Mona Lisa does not fall under copyright protection.
4. There is no obligation to attach copyright notice to copyrighted work, although it does makes make for fewer violations and increased chance of collecting damages.
What has not been discussed is Trademark. The Lone Cypress® is a trademark image of Pebble Beach Golf Club. It is a landscape image that is owned and registered for commercial purposes.
There may be buildings that are also registered trademarks and images of these buildings cannot be used for commercial purposes.
Jerry