I feel like I've had the good fortune of coming across some pretty remarkable flowers around the world, so I'll go with something interesting, rather than generically beautiful. I was going to dig up a photo of a cool Amorphophallus I found in Thailand years ago (I'm guessing A. paeoniifolius), but this one will do.
These are flowers of Monotropa hypopitys, an epiparasitic plant which does not contain chlorophyll, instead deriving its nutrients from fungi which in turn derive their nutrients from living plants. Because it does not photosynthesise, it has no need for any above-ground structure other than flowers, so all we ever get to see of the plant are these flowers.
While this species is currently still in the genus Monotropa, recent genetic evidence suggests it should be moved into its own genus Hypopitys. This photo was taken in the Dolomites in Italy in 2019.