The Pena Palace was built by a German architect who was inspired by Neuschwanstein castle in Bavaria. Both castles have been designed in a 19th Century Romantism style. The Pena Palace was originally painted with the intense colours that you can see – red, yellow, blue and green. In time though, the paint had become pale and no longer mirrored its original glow.
More about this image here: https://sumfinity.com/hdr-photos/portugal/pena-palace/