Does a sentence start with to?

I'm curious, could you clarify something for me? I've been reading about sentence structure and I came across the question, 'Does a sentence start with to?' Now, I understand that a sentence typically begins with a subject and a verb, but I've seen instances where 'to' is used at the beginning. Is this grammatically correct? Could you provide an example of a sentence that starts with 'to' and explain the grammatical rules behind it? I'm eager to learn more about this aspect of English grammar.