Financial companies force certain employees to take 2 uninterrupted weeks off. This is to reduce fraud--to get the employee out of the system so they auditors can look for irregularities. But if course it's a great way to force otherwise driven people to check out for long enough to reduce burnout.

Some companies also close entirely at times--usually the week between Christmas and New Years, but I have heard of a few places that pick a week in the spring or summer to close.