Checkpoint Charlie is a symbol of the Cold War period (1945 - 1991) when East and West Berlin were separated. The American sector was on the West side and the Soviet sector on the East side.
The American guard house is a popular tourist attraction. The name Charlie refers to border crossing checkpoint "C."
The checkpoint is the location of the Berlin Crisis in 1961 when US and Soviet tanks faced off against each other on either side of the border. The border wall was erected in 1961.
The site has been featured in several films:
1983 Octopussy (A James Bond film)
1965 The Spy Who Came in from the Cold (Richard Burton, Claire Bloom)
2015 Bridge of Spies (Tom Hanks)
Geoffrey W. Sutton has a PhD in psychology and writes about psychology and culture.
Website: https://www.suttong.com/
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ResearchGate page: https://www.researchgate.net/profile/Geoffrey-Sutton-2
Academia Page: https://evangel.academia.edu/GeoffSutton
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Google Map showing the location of the checkpoint and the related museum nearby.