Soaring above the tree-lined Paseo de la Reforma, the gleaming Continental Hilton tower dominates this bird's-eye chrome view of Mexico City circa 1969 — traffic streams below in both directions, skyscrapers recede toward the mountains, and the Angel of Independence column is just visible at the boulevard's vanishing point, a city of millions frozen in its confident post-Olympic-year swagger. The card travelled far: postmarked in Mexico City on 5 June 1969, it was written in Hungarian by a sender named Raci and mailed air-post to Géza in Târgu Mureș, Romania — a poignant Cold War detail of a traveller reaching across the Iron Curtain from Latin America.