2-Bedroom Hot Tub Cottage in Bala

Plas Newydd in Llangollen was the home of Lady Eleanor Butler and Sarah Ponsonby, two Irish ladies who eloped and set up house together in the late 18th century. It began as a five-roomed stone cottage and was enlarged with many Gothic features. It is now a museum.

Tip: Look closely at the outside of the house as well as the rooms, since the patchwork of reclaimed oak carvings is its most unusual feature.

Pontcysyllte Aqueduct carries the Llangollen Canal across the River Dee in the Vale of Llangollen. Designed by Thomas Telford and William Jessop, it is a cast iron trough held 127 ft (39 m) above the river on eighteen hollow masonry piers, with 19 arched spans. It is 336 yards (307 m) long and about 12 feet wide.

Harlech Castle is a medieval fortification in Gwynedd, built onto a rocky knoll close to the Irish Sea. Edward I had it built during his invasion of Wales, and it is one of the castles UNESCO includes in its World Heritage listing for the finest late 13th and early 14th century military architecture in Europe.

The Conwy Valley Railway Museum sits beside Betws-y-Coed railway station, on the site of the old goods yard. The museum building holds a collection of railway artefacts, and the attraction began with a former standard gauge railway carriage, which is a licensed buffet and restaurant car.

Dolwyddelan Castle is a thirteenth-century castle in Conwy County Borough, probably begun by Llywelyn ab Iorwerth, ruler of the Kingdom of Gwynedd, to guard an east-west route through his lands. It stands on a small knoll, with a keep on the east side and a tower on the west, joined by walls to form a roughly circular enclosure.

Whittington Castle stands in the village of Whittington in northern Shropshire, close to the Welsh border and the old fort of Old Oswestry. It began as a motte-and-bailey castle and was rebuilt in the 13th century, with buildings along a curtain wall, five towers on a raised platform, a moat and an outer gatehouse or barbican.

Tip: Look for the viewing mound in the centre of the site, which may be the oldest of its kind found in England.

Erddig is a late 17th-century country house near Wrexham, saved from dereliction in the 1970s. The Yorke family had an unusual relationship with their servants and commemorated them in portraits and poems, and the servants' quarters and estate workshops survive well. Outbuildings include the Joiners' Workshop, Smithy, Sawmill and Stables, and the house holds a fine collection of 17th-century furniture.

Tip: Postcodes aren't always recognised by sat navs, so follow the brown signs on the A525 or A483. Parking is free. Dogs are welcome in the garden and on the estate on a lead, but not in the Hall, Hayloft Restaurant, shop or Wolf's Den (assistance dogs are allowed everywhere). Check the National Trust dog page before you go, as rules can change.

Chirk Castle (Castell y Waun) was built in 1295 by Roger Mortimer de Chirk as part of Edward I's chain of fortresses across north Wales, guarding the entrance to the Ceiriog Valley. It was partly demolished in the English Civil War and then rebuilt, and the Myddelton family bought it in 1593. It is a National Trust property and Grade I listed.