Sunan Abi Dawud Book 2, Hadith 102
and the narrator Musa said: As far as Amr thinks, the Prophet (ﷺ) said: The whole earth is a place of prayer except public baths and graveyards.
Abu Salih narrated this tradition with a different chain of transmitters to the same effect as reported by Sulaiman b. Dawud. But this version has the word KHARAJA (he went out) instead of BARAZA (proceeded).
The Messenger of Allah (May peace be upon him) was asked about saying prayer at places where the camels kneel down. He replied; Do not say prayer at places where the camels kneel down because they are the places of devils. And he was asked about saying prayer in the fold of sheep. He replied: pray there because they are the places of blessing.