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The Dura-Europos church (235 AD) in Syria is the oldest church (house church) in the world. In Europe, one of the oldest and the fourth in the world is the Saint-Pierre-aux-Nonnains Basilica (380 AD) located in Metz, France.
Building forts in Ohio river valley
San Marino.
It is the sundial.
While there is no proof, prostitution is often claimed to be the oldest profession.