National Air and Space Museum in Washington, DC, USA. I only had an iPhone with me but worked this image over using Photoshop for this result without changing the framing. I particularly liked the way both the American and Soviet designations on their respective craft were hit with light at the same moment. Symbolically this event of merging these spacecraft says so much about what we can do when we try - - and many, many tried for years and years to get this level of cooperation between those representing themselves as the Federation and those unfairly demonized as Klingon.
The Apollo–Soyuz Test Project (ASTP) (Russian: Экспериментальный полёт «Союз» — «Аполлон», Eksperimantalniy polyot Soyuz-Apollon, lit. "Experimental flight Soyuz-Apollo"), in July 1975, was the first joint U.S.–Soviet space flight, and the last flight of an Apollo spacecraft. Its primary purpose was as a symbol of the policy of détente that the two superpowers were pursuing at the time, and marked the end of the Space Race between them that began in 1957. Please Google it to learn more.