Cardiff, Wales
Castell Coch, Cardiff CF15 7JS
William Burges's Victorian Gothic Revival rebuild for the 3rd Marquess of Bute, raised on the footprint of a genuine medieval castle in the woods above Tongwynlais. Its conical towers and richly painted interiors were designed as pure fantasy rather than a faithful restoration - the same partnership responsible for Cardiff Castle's interiors.
The fairy-tale exterior itself - conical, pointed roofs that look more like an illustration than a real building.
It's a short drive from Cardiff Castle, and many visitors pair the two in one day given how directly the interiors speak to each other (no review data was available for this site to draw further specifics from).
Victorian Gothic fantasy rebuild by William Burges; fully roofed