Penrhyn Castle has been rated one of the top five historic attractions to visit in Britain, according to the Which? list.
The Castle is the only Welsh attraction and only National Trust property to feature in the top five.
The 19th-century building sits between Snowdonia and the Menai Strait.
According to Which? the castle offers a glimpse into life at 'the height of Victorian opulence'.
It also houses one of the finest art collections in Wales, along with a railway museum and manicured gardens.
Other places to feature in the top five include Stirling Castle; the Houses of Parliament; Chatsworth House and Gloucester Cathedral.