Working in England as a US Citizen?

I was interested in working in England (or any country, really, doesn’t matter which), perhaps in a hostel or, if in another country, at a national park. The problem is that every website I’ve looked at says you need either a bachelor’s degree in something, or a working visa to be employed.

Basically I’m wondering about how and if I could get a job in another country without a special visa. I worked with a lot of people at a national park in Utah who were college students from other countries and didn’t have special visas, just their passports.

Any help, references, or guidelines would be greatly appreciated.

It’s a bit like having to have a green card to work in the US.

Every country has the right and duty to know who is inside their borders.