The Pierhead Building (Welsh: Adeilad y Pierhead) is a Grade I listed building of the National Assembly for Wales in Cardiff Bay, Wales. It stands as one of the city of Cardiff's most familiar landmarks and was built in 1897 as the headquarters for the Bute Dock Company. The clock on the building is unofficially known as the "Baby Big Ben" or the "Big Ben of Wales", and also serves as a Welsh history museum.