Eighteenth-century artist Caspar David Friedrich has a great portfolio of landscape and architectural art.
Here's what Russian diplomat A.I. Turgenev wrote in his diary about Friedrich's paintings:
As a rule, he expresses in them one thought or feeling, though vaguely. You may meditate over his paintings but not have a clear understanding of them, for they are vague even in his soul. They are dreams or daydreams.Link (via Right Some Good).
