THE RED KEEP
Aficionado's of George RR Martin's books in "A Song of Ice & Fire" (and/or of the TV series "Game of Thrones" and "House of the Dragon") know all about "The Red Keep", the imposing palace/fortress that dominates King's Landing in Westeros.
But there is a real castle that could very well also be called that (and it is on the Island of Malta, where many of the TV series' scenes have been filmed - but NOT those in or around The Red Keep).
This is St Agatha's Tower (aka The Red Tower), on a windswept corner of Malta, overlooking the strait to the smaller sister islands Cosimo and Gozo

We visited this spot on a stormy day in the winter of 2014-2015 (January 1, actually) when we were holidaying in Malta during a week with some of the roughest weather the island had seen in decades. Our plan for New Year's day was to visit the other islands, and we were glad that the ferry did indeed sail, despite the rough seas that had e.g. cancelled all harbour visits by small boat in the harbour of Valetta.
If not, we would have had to spend much more time at this Red Tower...
I did not underdo the saturation, but I did not exaggerate it much either in my processing. The colour of the structure is indeed this striking.