Lochside Stable House

Floors Castle is the seat of the Duke of Roxburghe, near Kelso in the Scottish Borders. Despite the name it is an estate house rather than a fortress, designed by William Adam in the 1720s and later given its turrets and battlements by William Playfair.

Tip: Different parts of the estate open at different times, so check the Floors Castle website for what is open and how to enter before you set off.

Chillingham Castle is a 13th-century fortress in Northumberland, listed Grade I. It stands on what was once the border between England and Scotland, and was repeatedly attacked and besieged. Edward I stayed here in 1298, and James I in 1617. Inside you can see its grand rooms, including the great hall, and walk through the gardens and grounds. There are lakes and a tearoom too.

Kelso Abbey was founded in the 1100s and was one of Scotland's largest and wealthiest religious houses. The monks moved here in 1128, close to King David I's new castle at Roxburgh. Next to nothing remains of the sprawling monastery precinct, but what survives of the church is one of the most spectacular architectural achievements in medieval Scotland.

Tip: Smailholm Tower is about 6 miles away and Dryburgh Abbey about 9 miles, so both are easy to add to the day.

Bamburgh Castle is a Grade I listed fortress on the Northumberland coast, built on a crag of volcanic dolerite above the North Sea. It covers nine acres of rocky plateau and is one of the largest inhabited castles in the country.

Tip: Prams and pushchairs aren't allowed in the State Rooms, so bring a baby carrier; there is a free shuttle buggy from the on-site car park up the hill.

Alnwick Castle is the seat of the Duke of Northumberland and has been home to the Percy family since 1307. It began as a Norman stronghold and grew into a major fortress on the Anglo-Scottish border. Inside the keep, the State Rooms include the Library, Drawing Room, Saloon, Dining Room and China Gallery. You can also walk the battlements and see the Victorian Great Kitchen.

Tip: Broomstick Training needs a time-slot ticket, and Alnwick Castle tickets don't include The Alnwick Garden, which has its own website.

Lindisfarne Castle is a 16th-century fort on Holy Island, reached across a tidal causeway. In 1901 Sir Edwin Lutyens turned it into an Arts and Crafts home, and inside you can see the stone vaults of the old Tudor gun battery. Outside, upturned boats serve as sheds, and there's a walled garden designed by Gertrude Jekyll.

Tip: Check the safe causeway crossing times before you travel, then park in the main island car park. The castle is a one-mile walk each way, and the approach is up steep cobbles, so wear sturdy footwear.

Mellerstain House is a Borders country house, and one of the first buildings Robert Adam designed in his 'Castle' style. Guided tours take you through rooms with his delicate plasterwork ceilings and wall decoration. The library is the finest of them. On the top floor, the gallery displays costumes, fans, embroideries and documents.

Tip: The house is open for tours only part of the year, while the gardens stay open year-round, so check the Mellerstain website before you set off.

Smailholm Tower is a 15th-century tower house near Kelso, in the care of Historic Environment Scotland. It is a remarkably complete laird's residence that still stands roofed and floored, perched on a crag with wide views over the surrounding countryside.

Tip: Book your visit online in advance for a specific date and time, and consider pairing it with nearby Dryburgh Abbey.