Landhaus was formerly the meeting place of the Styrian Parliament (in Styria also included parts of modern-day Slovenia and Italy). Now it is the seat of the Parliament of the Federal land.

In the XVI century the building was rebuilt under the guidance of the Italian architect Domenico Dell Allio. The facade of the loggia and large semi-circular Windows are decorated in Venetian style.

In the courtyard, note the magnificent three-story arched gallery of the Renaissance. The stairs of the patio – the work of the Italian architect Bartolomeo di Bosio.

Interior of conference hall is decorated in the Baroque style, doors decorated with carvings and the ceiling is stucco. As is well decorated and the knights ' hall.