It depends in which country it was minted.
The front side has a 1 and a map of Europe on it, the back is country-specific.
Despite the different design (per country) all Euros are legal tenders in...
the official common currency of 12 European Union nations (Austria, Belgium, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, the Netherlands, Portugal, and Spain). In 1999 the euro was...