Does immigration check visas or passports at US airports while?
When you enter Canada you will have to pass through Canadian border control, and they will want to see your passport. If you are a US citizen that is all you will need. They will generally be more interested in if you are able to get back into the United States once you are done visiting. If you are not a US or Canadian citizen, you will also need to submit an Electronic Travel Authorization before traveling. These two websites cover most situations and tell you what you will need: US State Depar...