Aside from plans, photographs and video presentations, the exhibition also features chairs from the Prague castle, a Plečnik-designed lamp and bench, as well as a model based on Plečnik's plan for the Slovenian parliament from 1947.

Plečnik, whose signature Vienna secession footprint can be seen around the Slovenian capital, especially in the city centre, saw the Ljubljana castle as the crown of the city and wanted to give it a monumental shape and new purpose.

His first plan for the castle from 1931-1932, called the Slovenian Acropolis, was to serve as a museum and cultural space, while his second plan for the hill overlooking the city from 1947 envisaged a parliament house in a monumental octagonal shape.

Also on display will be Plečnik's plans for monumental access to the castle, which also envisaged radical changes in the city centre at the foot of the castle hill.

The exhibition marks 145 years of the most important Slovenian architect's birth and 60 years of his death.

Plečnik left his mark in three European capitals - Vienna, Prague and Ljubljana.

In Vienna, he first worked in the bureau of Otto Wagner and later continued on his own.

From 1911 to 1921 he taught in Prague and in 1920 he was selected to redo the Prague castle.