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Located in the heart of Sintra, this lovely estate was built at the beginning of the 20th Century by order of Portuguese millionaire António Augusto Carvalho and is regarded as an architectural dream come true. Designed by visionary Italian architect Luigi Manini, this five-storey UNESCO World Heritage Site is distinguished for its blend of Gothic, Manueline and Neoclassic features, a beautiful chapel, abundant gardens, elegant ponds and lakes. One of the estates most intriguing features is its spiralling stairway a long set of steps leading you down to a mysterious area of underground grottoes and caves.
*picture not mine*
*thanks to http://www.portugal-live.net*
Source link: http://www.portugal-live.net