For season 1 an episode in Pakistan was planned. Two weeks before recording was supposed to take place a terrorist attack happened which saw all visas retracted and the episode had to be cancelled.
The fourth season is also known as "Reizen Waes Europe" because all destinations are located in Europe.
Antarctica has been on the shortlist for years, but due to the high production costs, this episode has not been realized yet.
The episode in North Korea was initially planned for the first season, but it eventually made it into the second season due to delays with various permits.
The episode in Sierra Leona was initially planned for the second season, but due to an outbreak of the Ebola disease in West Africa, this travel destination was postponed till season 3.