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Hinterbrühl
Hinterbrühl
Municipality
	Southeast view of Hinterbrühl
	Coat of arms
	Hinterbrühl Location within Austria
	Coordinates: 48°5′N 16°14′E / 48.083°N 16.233°E
Country	Austria
State	Lower Austria
District	Mödling
Government
• Mayor	Erich Moser (ÖVP)
Area
• Total	16.94 km2 (6.54 sq mi)
Elevation	280 m (920 ft)
Population (2018-01-01)
• Total	4,029
• Density	240/km2 (620/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	2371, 2393
Area code	02236, 02237
Website	www.hinterbruehl.com

Hinterbrühl (German pronunciation: [ˈhintɐˌbʁyːl] ^ⓘ) is a town in the district of Mödling in the Austrian state of Lower Austria. It is home to the Seegrotte, a system of caves including Europe's largest underground lake. During World War II, a satellite camp of Mauthausen concentration camp was opened inside the caverns, producing parts for the He 162 Spatz jet fighter.

History

Hinterbrühl was settled as early as 6,000 years ago.

Like neighboring areas, Hinterbrühl suffered mightily under the two Turkish sieges of 1529 and 1683. Since a majority of the population was killed, the area was inhabited by settlers who moved north from Styria after 1683.

From 1883 to March 31, 1932, Mödling and Hinterbrühl Tram, the first electric streetcar in continental Europe, linked Hinterbrühl to Mödling railway station. Today, only the Bahnplatz remains of this historic achievement.

On August 4, 1943 a satellite camp of Mauthausen concentration camp was built in the city. The prisoners there built parts, sub-assemblies and BMW 003 turbojet engines for the He 162 Spatz (sparrow) jet fighter in a hastily converted underground factory during late autumn and spring 1945. The 162, created for the Emergency Fighter Program and the winner of the Volksjäger ("People's Fighter") aviation design competition, was an extremely lightweight, cheap and fast plane that could be discarded if it suffered any damage. Hinterbrühl was just part of a vast crash production program where dozens of factories of varying sizes would make parts for the jet, then send them to sites like Hinterbrühl for final assembly and transshipment to flight test centers — or even directly to airbases, such was the desperate last-minute nature of the enterprise.

In the last days of the war in 1945, the inmates of other camps had to make a 200 km-long march to the concentration camp Mauthausen in Hinterbrühl. Virtually none of them survived. Fifty-one inmates were killed, even before the march, by gasoline injections or strangled by SS-officers. In 1988 a monument was erected above the Subterranean Lake to honor the 51 victims of this massacre.

From 1964, the SOS Children's Villages in Hinterbrühl was led by Austrian pediatrician Hans Asperger.^[3]

Population

Historical population
Year	Pop.	±%
1869	1,231	—
1880	1,417	+15.1%
1890	1,708	+20.5%
1900	2,055	+20.3%
1910	2,408	+17.2%
1923	2,294	−4.7%
1934	2,462	+7.3%
1939	3,283	+33.3%
1951	3,228	−1.7%
1961	3,230	+0.1%
1971	3,677	+13.8%
1981	3,989	+8.5%
1991	4,150	+4.0%
2001	4,020	−3.1%
2011	4,068	+1.2%

Seegrotte

The Hinterbrühl Seegrotte (Lake Grotto) is a large underground lake located in Hinterbrühl. This grotto is an important historic site. It used to be open to the public for tours. The grotto is actually an old gypsum mine. By the end of 1800 it was used to make red and white plaster. In 1912 a blast released millions of gallons of water and flooded the lower caverns of the mine, creating the largest underground lake in Europe. In the 1930s a team of cave explorers found the lake and finally managed to open the grotto for the public. The upper (non-flooded) tunnels of the same old mine were reused by Nazi German authorities as an aircraft-manufacturing facility which used forced labor.

Höldrichsmühle

Höldrichsmühle, an old mill, is a hotel in Hinterbrühl that was featured on the 24g Austrian definitive stamp of 1945 (SG936). Höldrichsmühle was a regular subject for postcards from the late 1890s onwards. Many of these cards claim an association with the composer Franz Schubert, and there have been various plaques and internal features in support of these claims. Early postcards claim that Schubert wrote Die schöne Müllerin here, later cards claim that it was Der Lindenbaum (from Winterreise). There is no documentary evidence to support these claims, though there is a claim in Deutsch's Schubert: Memoirs by his friends^[4] made by Hermann Rollett in 1897 that he had seen Franz Schubert at Höldrichsmühle around 1825 or 1826, when Rollett was aged seven.