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Photo: John Lord, CC BY-SA 2.0 via Wikimedia Commons
A Norman ringwork castle within an older Iron Age hillfort (as at Caer Penrhos). Much of the site has been overgrown with vegetation.
Caerau Hillfort is a large triangular multivallate Iron Age hillfort, built on a previously occupied Neolithic site, occupying the western tip of an extensive ridge-top plateau in the western suburbs of Caerau and Ely, Cardiff, Wales. It is the largest Iron Age site of its type in south Wales and also one of the largest in Great Britain. The old parish church, St Mary's, and a small ringwork, almost certainly a medieval castle site probably contemporary with the church, stand within the hillfort on the north-eastern side.
© OpenStreetMap contributors
Known universally as St Fagans (pronounced "FAG-uns") after the village it's in, this is easily Wales's most popular visitor attraction. An open-air museum of vernacular buildings from all parts of Wales rebuilt, stone by stone, in the grounds of St Fagans Castle, an Elizabethan manor house. The castle gardens, dating from the 19th century, are especially beautiful. You may not be able to see everything in a single visit due to the size of the grounds. Also contains permanent indoor exhibitions on Welsh social and cultural history. Great for kids.
Canton. Arthouse and alternative cinema.
Welsh: Eglwys Gadeiriol Llandaf
In the ancient 'city of Llandaff', now incorporated into the north west of the city, and is one of the oldest religious sites in Europe. The cathedral dates from 1107 and features some spectacular architecture. After bomb damage in World War II it was very boldly restored; the huge statue of Christ in Majesty by Jacob Epstein tends to divide opinion, but is well worth a look. The cathedral school was where the famed children's author Roald Dahl was educated in the early part of his primary school life. The surrounding village is an interesting place to explore with a local coal magnate's house (Insole Court) donated to the people of Cardiff and open for visitors. The Ghost Tour has really become the thing to do in the area, making it into the Guardian's top 10 list of things to do in the UK.
Welsh: Stadiwm y Mileniwm
Also known as the Principality Stadium. A 74,200-seater stadium, opened for the 1999 Rugby World Cup, and now home to the Wales national rugby team. It hosted the FA Cup Final for some years during the redevelopment of Wembley Stadium in London and is still the largest stadium in Europe with a completely retractable roof (good for those rainy days). A must see for any sport lover, tours are available online or at the ticket desk. Tours cost £16.50 for adults, £12 for children.
Look out for events at the Millennium Stadium too.