Netherlands King Willem-Alexander (L) and Spanish King Felipe (2nd L) tour of the test center of the European Space Research and Technology Center (ESTEC) in Noordwijk on April 18, 2024. The Spanish royal couple are on a two-day state visit to the Netherlands. (Photo by Koen van Weel / ANP / AFP) / Netherlands OUT (Photo by KOEN VAN WEEL/ANP/AFP via Getty Images)