The Obelisk is located on top of the Spanish steps and above the the Piazza di Spagna. The Trinità dei Monti church is behind the Obelisk.
https://en.wikipedia.org/wiki/Spanish_Steps
https://en.wikipedia.org/wiki/Piazza_di_Spagna
https://en.wikipedia.org/wiki/Trinit%C3%A0_dei_Monti