6 Continents?!! Where specifically if I might ask.
In Africa I've spent 5 weeks in Ghana, 2 months in Senegal, and 2 months in The Gambia. I've also set foot in a few villages in Burkina Faso. These were three separate medical trips.
In South America I've spent 5 weeks in Peru -- 4 weeks working at a clinic in the Amazon and a week in the Andes (did the Inca Trail to Macchu Picchu).
In Europe I've been to Spain, France, Belgium, Iceland, Norway, and Russia.
In Asia I've only been to Japan, accompanying my wife to a meeting for a week in Kyoto.
In "Oceania" I've spent 5 months in New Zealand studying abroad in college.
And in North America I've been all over the US, to Canada, Mexico, Antigua, and The Bahamas. I've been to Hawaii 5 times and I worked for a month in Juneau Alaska in a native health clinic.
So a lot of work and study-related travel. Oh, Mt. Rainier IS beautiful, you're lucky! Only 14,000 feet tall, though -- the tallest American mountain outside Alaska is Mt. Whitney in California at ~ 14,400 feet.