The 'Captain America: The First Avenger' star wishes he had a way to recapture the contentment he feels whenever he watches the sun going down or spots a waterfall but doesn't want to figure out why the experiences make him feel so "out of his brain".

Explaining why he is happiest said: "I always say that the times in my life when I've been happiest are the times when I've seen, like, a sunset.

"The point is that when I see a sunset or a waterfall or something, for a split second it’s so great, because for a little bit I’m out of my brain, and it’s got nothing to do with me. I’m not trying to figure it out, you know what I mean? And I wonder if I can somehow find a way to maintain that mind stillness.”

The 29-year-old actor also admitted he rejected the role of Captain America several times and, despite feeling "happy and content" every time he did so, he eventually realised it was the movie he had been waiting for.

He told the new issue of America's GQ magazine: “I said no a bunch, and every time I said no, I woke up the next morning so happy and content. I kept saying no; they kept coming back. And eventually I was like, ‘You know what? This is your biggest fear—this is exactly what you have to do.’”