<p>An engineering back-up of the Apollo Command and Service Module, docked with a model of a Soyuz 7K-TM spacecraft.  The docked spacecraft mimics the Apollo-Soyuz Test Project -- in which Soviet and American spacecraft docked together in space as a means of reducing tensions during the Cold War.
</p><p>On display in the Smithsonian Air and Space Museum.
</p><p>In 1970, after more than eight years of negotiations, the United States and the Union of Soviet Socialist Republics (USSR) signed an agreement to attempt a docking of a Soviet and American spacecraft in Earth orbit, and to conduct joint scientific experiments in space.  Technical challenges took four years to overcome.  
</p><p>Soyuz and Apollo lifted off within seven hours of each other on July 15, and they docked on July 17.  Three hours passed, while the docking ring pressurized and the atmospheric pressure between the two craft was equalized.  Thomas P. Stafford and Alexei Leonov (the first human being to conduct a spacewalk) shook hands on the threshold between the two craft. 
</p><p>The docking was formally named the Apollo-Soyuz Test Project (ASTP).
</p>
The Soyuz spacecraft is a full-scale model built by Energia Design Bureau, the organization that built the actual Soyuz spacecraft.  The Soyuz descent module is on display at the RKK Energiya museum in Korolyov, Russia.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/23165290@N00">Tim Evanson</a> from Cleveland Heights, Ohio, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/timevanson/7275762810/">Soyuz - Smithsonian Air and Space Museum - 2012-05-15</a>