A castle probably predated the village; this part of Castin is called Castelbieilh (old castle).
The village is proud of its flowerscapes, which have earned it an official "two-flower" rating.
Don't miss, in Castin
- The Saint Geniez church possesses various treaures: listed statues, a Gallo-Roman statue under the church porch, and paintings by Smets and Augustin Lagardes.
- Le viaduct is a work of railway architecture built in 1900 .
- The "Cœur de Gascogne" GR footpath crosses through the village.
A video presentation of the viaduct
in August : last week end, local feast