Really enjoying this thread (maybe too much!)
My list would be:
Aidan Turner
Robert Redford
Eric Bana
90s Brad Pitt
Matthias Schoenaerts
80s Harrison Ford
But the most beautiful man I've ever seen walked past me in London and I swear I gasped. I literally turned around and watched him with my mouth open. I never understood the phrase 'breath-taking' beauty until I saw him.