NARVA, June 5 (Xinhua) -- A team competes in Soapboxes Derby in Narva, third largest city of Estonia on June 4, 2016. Fifteen teams from different parts of Estonia along with 7 teams from U.S. Embassy and U.S. army based in Estonia took part in traditional Soapboxes Derby competition in Narva on June 4, 2016. (Xinhua/Sergei Stepanov)