Re: When a pious person died they make a place of worship at his grave
The Graves are to be taken as places of Dua [Worship], but not to direct acts of worship directly towards them [Sajda]
Every time we go to Graves we Worship Allah by invoking Allah Subhanahu wa Ta’ala for them. Peace be upon You [As Salam Alaikum], reading Fatiha and Surah Ikhlas, Durood
All the above acts are directed towards Allah Most High, with the exception of the Salam, and what is meant by the Salam is ‘‘Allah put peace upon them’’ although it is said directly to the people ‘‘peace be with you’’
Conclusion is that we take Graves as places of Worship!
Conclusion 2 is that we take the Graves as a place of Tawassul, since we desire the Muslims to return Salam to us, and we recite Surah al Fatiha for ourselves especially at these sites