Very impressive brick-built dovecote at Croxall Hall in Staffordshire. Dovecotes were so big because the houses whose land they are on used to keep doves for their flesh, eggs and dung.
Croxall Hall itself dates from the late 16th century so the dovecote could be around 400 years old SK 195 138
The British Dovecote Society What is a Dovecote?
Not the original doorway, I suspect; it would have been a bit smaller