Go to community college. Without question. In a lot of cases, you'll get more of an education than in University. Got a lot of young, inspired teachers or teachers not distracted by research, and it's less of a shameless degree farm.
That said, you'll want to be thinking about transfer from the get go. An Associates degree will get you [censored] all in the way of job opportunities, and two years goes by fast. You'll be done before you even start, really. Two years goes by fast. Be prepared to work your butt off. You won't need an incredible GPA to transfer, and CC is easy peasy, but it will open doors. And NEVER walk away from classes. When I was 18, I dropped out of Community College midsemester without bothering to withdraw. Result was a .75 GPA. Three semesters of nearly perfect scores, and I transferred with the estimable GPA of 2.91. Your GPA will pretty much get wiped when and if you transfer, but doing well out the gate will save you a lot of grief.
Look up all of the professors on Ratemyprofessor.com before you even enroll. I failed to do this last semester, and it landed me with a nightmare class that I had to work so damn hard on just to get a C that all of my other classes took a hit as well. See, some teachers (more in university than CC) see themselves as gatekeepers, and live to keep the riff raff out. Make sure you don't get one of these guys.
Pretty much any History of Western Europe class will look at England in detail, but you'll not likely find a class at CC for Ireland or Mongolia. Maybe Mongolia in the "Mongols" sense in an Asian or Middle Eastern History course, but nothing devoted solely to Mongolia. You're looking at grad school stuff there, I think. But, you put in the time, and you'll pretty much be able to study whatever you're interested in. You start general, and you specialize gradually as you go.
Shameless Major plug here: If you want to learn about the world, History is all well and good, particularly with the postmodern "Let's focus on the common people" approach, but if you want to understand the world as it is, you can't go better than Cultural Anthropology. Like History and Geography, it's a masters program at least (as in, there's a lot of bachelors of all three flipping burgers), but it pays off. Essentially, say you're interested in Mongolia. So, go live there for a couple years, meet people, observe them, study them, and write about it. And the only way you can do that is by getting an in into their culture and actually participating in it. We call that participant observation. And you can do that anywhere. Want to study the people of the Ireland? Go ahead. Want to study the culture of truckers in America, you can do that to. If there's a culture, you study it. You'll learn a lot about the world fairly quickly. Unlike history, you're focused on the here and now (with some understanding of history by necessity) and unlike geography, you're focused on people rather than borders and landmasses.