1820s
- 1829 – The panopticon-design Eastern State Penitentiary in Philadelphia, designed by John Havilland, opens.
- 1828 – Completion of the Marble Arch in London, designed by John Nash.
- 1827 – William Burges, Gothic Revival architect in Britain, is born.
- 1826 – The Menai Suspension Bridge over the Menai Strait, in Wales, designed by Thomas Telford, is completed.
- 1825 – The front and rear porticoes of the White House are added to the building.
- 1824 – The Shelbourne Hotel in Dublin, Ireland is completed.
- 1823 – Work begins on the British Museum in London, designed by (Sir) Robert Smirke.
- 1822 – Birth of landscape architect Frederick Law Olmsted.
- 1821 – Karl Friedrich Schinkel completeds his Schauspielhaus in Berlin.
- 1820 – Death of Benjamin Latrobe.
Read more about this topic: Timeline Of Architecture