BERLIN — Adolf Hitler’s mountain retreat in Bavaria is getting a makeover, with a 17-million euro ($22.5 million) renovation project that will enlarge the historical information center now there.

The Bavarian government said Tuesday that building should begin in 2015.

The daily Sueddeutsche Zeitung reports the 1,000 square meter (11,000 square foot) center will be expanded to 2,500 square meters (27,000 square feet) in a project that will take until 2018.

The center includes details on Obersalzberg – the mountain ridge where Hitler had his Eagle’s Nest retreat and Berghof home and headquarters – as well as on the Nazi regime in general.

The alpine village was a second center of power after Berlin for the Nazis, with high-ranking officials like Herman Goering, Albert Speer and Martin Bormann also keeping homes there.

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• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: Adolf Hitler at the patio of the Berghof, wearing civil clothes, sitting in a basket-chair and reading files. Photography, around 1936. (Photo by Imagno/Getty Images)

• circa 1940: Adolf Hitler’s mountain retreat at Obersalzberg, above Berchtesgaden in Bavaria. This chalet or ‘Berghof’ was destroyed in 1953, lest it become a shrine to Hitler. Original Publication: From ‘Germany Awakes’ by Heinrich Hoffmann. (Photo by Heinrich Hoffmann/Hulton Archive/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: The Berghof (formerly house Wachenfeld) in its original state, before the modification in 1936, in front of the house a flag with fylfot. Photography, around 1934. (Photo by Imagno/Getty Images)

• Adolf Hitler and Hermann Goring in Obersalzberg near Berchtesgaden in Bavaria (where Hitler has his Eagle’s nest), 1930s (Photo by Apic/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: The Berghof with its two finished drive-ups. Photography, around 1939. (Photo by Imagno/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: View from below at the Berghof. Photography, around 1936. (Photo by Imagno/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: Adolf Hitler at the window of a train leaving Berchtesgaden. Photography, around 1936. (Photo by Imagno/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: Adolf Hitler wearing a uniform with a little girl wearing a traditional costume, in the background the Berghof. Photography, around 1936. (Photo by Imagno/Getty Images)

• The Berghof of Adolf Hitler at the Obersalzberg near Berchtesgaden: View from above at the snow covered Berghof in winter. Photography, around 1936. (Photo by Imagno/Getty Images)

• Exhibitions of Nazi history in Documentation Centre Obersalzberg, Berchtesgaden, Bavaria, Germany, Europe

• A file picture taken on 10 January 2005 shows the new built luxury hotel at the Obersalzberg mountain near Berchtesgaden, southern Germany. The Interncontinental hotel, constructed at the historic site of German dictator Adolf Hitler’s Alps residence, provoqued a controversial discussion between historians and tourism agents. (JOHANNES SIMON/AFP/Getty Images)

• Visitors inspect the lobby of the new built luxury hotel at the Obersalzberg mountain near Berchtesgaden, southern Germany, during an open day 27 February 2005. (TIMM SCHAMBERGER/AFP/Getty Images)

• Visitors inspect the so-called President Suite of the new built luxury hotel at the Obersalzberg mountain near Berchtesgaden, southern Germany, during an open day 27 February 2005. (TIMM SCHAMBERGER/AFP/Getty Images)

• Visitors inspect the new built luxury hotel at the Obersalzberg mountain near Berchtesgaden, southern Germany, during an open day 27 February 2005. (TIMM SCHAMBERGER/AFP/Getty Images)

• A file picture taken on 10 January 2005 shows the new built luxury hotel at the Obersalzberg mountain near Berchtesgaden, southern Germany. (JOHANNES SIMON/AFP/Getty Images)