The Senedd is preparing to move out of its debating chamber - Y Siambr - ahead of a revamp.
The familiar centrepiece of the Welsh Parliament in Cardiff Bay will be closed for renovation work until next March.
It's being altered in order to accommodate the increase in Senedd members from 60 to 96 after next year's elections.
The Siambr will host its final session next Wednesday before proceedings move to the original home of the then Welsh Assembly following the Easter recess.
Formerly known as Crickhowell House, it was the original debating chamber from the start of Welsh devolution in 1999 until 2006, when the main Senedd building was opened.
The old Siambr has remained in use for educational visits and mock debates - but now, the politicians will return after a 19 year absence for its twice-weekly meetings from the end of April.
Elin Jones, the Senedd's presiding officer ('Llywydd') said: "This week, we prepare to say goodbye to the Siambr we have grown used to over the last 19 years and move onto the next chapter of Wales' democratic journey."
"Our temporary home will be familiar to some, as we move back into Siambr Hywel whilst the builders get to work in the Senedd. Of course, things have changed quite a bit since we were last there in 2006."
"Today, we have a fully-fledged parliament with law-making and tax-varying powers, and it's been a long journey towards a Senedd that is best able represent the people of Wales and hold the government to account."
"I'm proud to be part of an institution that looks forwards, not backwards. The changes coming to this building will future proof our parliament, making it fit for purpose for the next 100 years."
The Senedd will remain open to the public six days a week, except for the Siambr viewing gallery, which will be closed for a time during construction work.
A viewing gallery for Siambr Hywel will also be open with the Senedd's exhibitions, events, cafe and shop continuing throughout the period, along with guided tours, visits and educational sessions.
The changes to the Siambr will involve panels at the back of the room being remove to allow more desk space for the increased number of MSs
The steps will be removed to improve accessibility along with essential maintenance to broadcast and lighting systems.
The next Senedd elections will also see first-past-the-post voting replaced with a new 'closed proportional list' system and sixteen new 'super constituencies' electing six members each.
The Vale of Glamorgan constituency will be merged with Bridgend while the Cardiff South and Penarth seat is being paired with Cardiff West.
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