The cast members have made various trips throughout Korea, including many offshore islands. The most notable trip to date was to the Liancourt Rocks, controversial due to the ownership claims on the island by both South Korea (which calls them Dokdo) and Japan (which calls them Takeshima). On their 17th trip to Wando County in South Jeolla, the cast was told to live and experience the wildlife having no access to their cellphones and having to build a tent on their own with the materials provided by the production crew. In June 2008, they travelled to Baekdu Mountain (Changbai Mountain), which is located on the border of North Korea and China. The trip took 4 nights and 5 days, rather than usual 1 night and 2 days. They took the scenic route to Baekdu Mountain by taking a boat to China than taking a bus to the actual mountain rather than taking a direct flight in order to film the beautiful scenery along the way. After climbing up the stairs leading up the mountain they reached Heaven Lake (천지, 天池), one of the highest crater lakes in the world. At Heaven Lake they symbolically poured water from the Liancourts, the disputed easternmost island of Korea; Udo (우도), one of the southernmost islands of Korea; Gageodo, the westernmost island of Korea; and Baengnyeong Island, the northernmost island in the Yellow Sea. This was to symbolize their wish for Korea to once again become one united nation just as the waters became one at Heaven Lake. Near the end of 2009, it was rumored that a trip for Antarctica was being planned. The producer confirmed that they are trying to arrange a journey to the South Pole and on the 125th episode, Kang Ho-dong mentioned to Park Chan-ho that the trip will take place in March. However, the trip was canceled due to the 2010 Chile earthquake. There was also a viewers' special trip on February 2009, where the production team started gathering 6 teams for a trip with the cast. Thousands of applications were sent to the team and the final teams were chosen by the casts themselves. The episode became very popular and on December 2009, the production team announced that a second viewers' special is coming on February 2010 and mentioned that they received around 100,000 applications. In August 2011, the had third viewer's special, which had 100 people attending from ages 1–100, adding another senior, who's age is 102.