Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

People watch as Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

People watch as Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)

Estonian slackliner Jaan Roose walks on a 500-meter-long tightrope stretched between the Palace of Culture and Science and Varso Tower, 180 meters above Warsaw, on May 31, 2026. (Photo by Sergei GAPON / AFP via Getty Images)