- Suzhou, China (2017)
- Nottingham, UK (2016)
- Cassis, France (2015)
- Tsukuba, Japan (2014)
- Maryland, USA (2013)
- Ceský Krumlov, Czech Republic (2012)
- Lindau, Germany (2011)
- Kanazawa, Japan (2010)
- New Haven, USA (2009)
- Madrid, Spain (2008)
- Antalya, Turkey (2007)
- Kobe, Japan (2006)
- Bad Essen, Germany (2005)
- Seattle, USA (2004)
- Dingle, Ireland (2003)
- Montreal, Canada (2002)
- Kyoto, Japan (2001)
- Hamburg, Germany (2000)
- Pontresina, Switzerland (1999)
- Osaka, Japan (1998)