Gatehouse (noun)

1. A small building or lodge at the entrance to a park, estate, or castle.
2. A building located at the entrance of a property, serving as the main point of access and security.

Origin:

The word "gatehouse" is derived from the middle english word "gatehous" which means "house near or at the gate".

Examples:

1. The visitors had to stop at the gatehouse to sign in before entering the park.
2. The gatehouse was guarded by a security guard who checked the visitors' IDs before allowing them to enter.
3. The gatehouse was designed to blend in with the architecture of the castle and was surrounded by a moat.
4. The gatehouse served as a security checkpoint and also housed the main office of the estate.
5. The gatehouse was the first building visitors would see when entering the estate, so it was important for it to make a good impression.