Question: Since 1923 where was the Spengler Cup been held?
Context: The 2012 Spengler Cup was held in Davos, Switzerland between 26 and 31 December 2012.  All matches were played at HC Davos's home known as Vaillant Arena.  Six competing teams were split into two groups of three.  The two groups, named Torriani and Cattini, were named after legendary Swiss hockey players Richard 'Bibi' Torriani and the Cattini brothers, Hans and Ferdinand. The Tatra Cup (Slovak: "Tatranský pohár" ) is an annual ice hockey tournament held in Poprad, Slovakia.  It is the second oldest European club tournament, after the Spengler Cup. The 2005 Spengler Cup was held in Davos, Switzerland, between December 26, 2005, and December 31, 2005.  All matches were played at Davos' home arena Eisstadion Davos. The 2002 Spengler Cup was held in Davos, Switzerland between December 26, 2002 and December 31, 2002.  All matches were played at host HC Davos's home Eisstadion Davos.  The final was won 3-2 by Team Canada over host HC Davos. The 2006 Spengler Cup was held in Davos, Switzerland between December 26, 2006 and December 31, 2006.  All matches were played at HC Davos' home arena, Vaillant Arena.  Brent Payne, a member of Modo played for Team Canada and scored a total of 7 points, including 4 goals and 3 assists. The 2011 Spengler Cup was held in Davos, Switzerland between 26 and 31 December 2011.  All matches were played at host HC Davos's home Vaillant Arena.  The number of teams was expanded in 2010 from 5 to 6 in comparison to previous seasons, and split into two groups of three.  The two groups, named Torriani and Cattini, were named after legendary Swiss hockey players Bibi Torriani and Hans Cattini.  HC Davos won the event for a record 15th time. Hockey Club Davos is a professional Swiss ice hockey club based in Davos, Switzerland.  Davos plays in the National League (NL).  The team is usually a strong force in the league and often bolster their roster with Swiss national team players and players who once played for National Hockey League teams.  HC Davos also has hosted the annual Spengler Cup tournament, an invitational competition, since 1923. The Spengler Cup is an annual invitational ice hockey tournament held in Davos, Switzerland.  First held in 1923, the Spengler Cup is often cited as the oldest invitational ice hockey tournament in the world.  The event is hosted by the Swiss team HC Davos and played each year in Davos, Switzerland, between Christmas (December 25) and New Year's Day.  Currently, all games are held at Vaillant Arena. The 2009 Spengler Cup was held, as it always was, in Davos, Switzerland between 26 and 31 December, 2009.  All matches were played at host HC Davos's home Vaillant Arena.  The tournament featured all of the last year's tournament participants except for last year's winners Dynamo Moscow who was replaced by Dinamo Minsk and ERC Ingolstadt who was replaced by Adler Mannheim. The 2013 Spengler Cup was held in Davos, Switzerland between 26 and 31 December 2013.  All matches were played at HC Davos's home known as Vaillant Arena.  Six competing teams were split into two groups of three.  The two groups, named Torriani and Cattini, were named after legendary Swiss hockey players Richard 'Bibi' Torriani and the Cattini brothers, Hans and Ferdinand.
Answer: Eisstadion Davos