Cardiff Castle stands in the centre of the Welsh capital. It has a Roman fort, a Norman keep on a mound and a Victorian Gothic mansion with richly decorated rooms by William Burges. Tunnels in the walls were used as air raid shelters in the Second World War.

Snowdon, Yr Wyddfa in Welsh, is the highest mountain in Wales at 1,085 metres, in Eryri National Park. Several paths lead to the summit, and the Snowdon Mountain Railway, opened in 1896, climbs from Llanberis. On clear days the views reach Ireland. It is the busiest mountain in Britain.

Caernarfon Castle was built by Edward I from 1283 on the shore of the Menai Strait in north Wales. Its polygonal towers and banded stone walls were modelled on the walls of Constantinople. It was the site of the investiture of the Prince of Wales in 1969. It is a UNESCO World Heritage Site.

Portmeirion is a village on the coast of north Wales built between 1925 and 1975 by the architect Clough Williams-Ellis in the style of an Italian village. Its pastel buildings, piazzas and gardens look over the estuary of the River Dwyryd. It was the setting for the TV series The Prisoner.

Conwy Castle was built by Edward I between 1283 and 1289 during his conquest of Wales. It has eight great towers and stands beside the Conwy estuary. The town walls, with 21 towers, still surround the old town. It is part of a UNESCO World Heritage Site with other castles of Edward I.

Titanic Belfast is a museum in Belfast's Titanic Quarter, opened in 2012, on the slipways where RMS Titanic was built. Its building, with four angular wings like ship bows, is about the same height as the Titanic. Galleries tell the story of the ship, from construction to its sinking in 1912.

The Dark Hedges is an avenue of beech trees near Ballymoney in County Antrim, planted in the 18th century by the Stuart family. Their branches arch over the road, forming a tunnel. It became famous after appearing in Game of Thrones. The road is now closed to traffic to protect the trees.

The Giant's Causeway on the north coast of Northern Ireland is made of about 40,000 interlocking basalt columns, most of them hexagonal. They formed from a volcanic eruption about 60 million years ago. Legend says the giant Finn McCool built it to cross to Scotland. It is a UNESCO World Heritage Site.