Question: Old Slains Castle is a ruined castle near Collieston in Aberdeenshire, Scotland that is near another ruined castle called Slains Castle, also known as what?

Context paragraphs:
Slains Castle: Slains Castle may refer to one of two ruined castles in Aberdeenshire, Scotland:

Old Slains Castle: Old Slains Castle (otherwise known as Old Castle Slains) is a ruined castle near Collieston in Aberdeenshire, Scotland.

National Museum of Wildlife Art: The National Museum of Wildlife Art (NMWA) is a museum located in Jackson Hole, Wyoming, United States that preserves and exhibits wildlife art.  The 51,000 square foot building with its Idaho quartzite façade was inspired by the ruins of Slains Castle in Aberdeenshire, Scotland and echoes the hillside behind the facility.  Located on a bluff called East Gros Ventre Butte in the midst of a real wildlife habitat, the institution overlooks the National Elk Refuge and is situated 2.5 miles north of the town of Jackson.  The core of the collections reflects traditional and contemporary realism.  The Museum's centerpiece is a collection of works by Carl Rungius (1869-1959) and Bob Kuhn (1920-2007).  In addition to 14 galleries, the museum has a Sculpture Trail, Museum Shop, Restaurant, Children’s Discovery Gallery, and Library.  More than 80,000 people visit every year, and over 10,000 children visit the Museum each year, often as part of their school curricula.

Bognie Castle: Bognie Castle (also called Conzie Castle) is a ruined castle near Huntly, in the Aberdeenshire region of Scotland.  It was built in the 17th century and is now ruined.  It once rose 4 storeys high.

Fedderate Castle: Fedderate Castle is a ruined castle near New Deer in Aberdeenshire, Scotland.  A drawbridge and causeway provided access to the castle.  Lord William Oliphant with Jacobite forces, took control of Fedderate Castle and held out against the forces of Hugh Mackay for more than 3 weeks, surrendering in October 1690.

Wegelnburg: The Wegelnburg is a ruined castle near Schönau in the Palatinate Forest in Rhineland-Palatinate, Germany, near the border with France.  Its location is at a height of 572m, making it the highest ruined castle in the Palatinate Forest.

New Slains Castle: Slains Castle, also known as New Slains Castle to distinguish it from nearby Old Slains Castle, is a ruined castle in Aberdeenshire, Scotland.  It overlooks the North Sea from its cliff-top site 1 km east of Cruden Bay.  The core of the castle is a 16th-century tower house, built by the 9th Earl of Erroll.  Significant reconstruction of the castle has been carried out a number of times, lastly in 1837 when it was rebuilt as a Scots Baronial mansion.  At one time it had three extensive gardens, but is now a roofless ruin.  Plans to restore the castle have been on hold since 2009.

Rahan Castle: Rahan Castle, also known as McSwyne’s Castle and Castle Murray, is a ruined castle near Dunkineely, County Donegal, Ireland.  The castle was once a stronghold of Clan Suibhne.

Kildrummy Castle: Kildrummy Castle is a ruined castle near Kildrummy, in Aberdeenshire, Scotland.  Though ruined, it is one of the most extensive castles dating from the 13th century to survive in eastern Scotland, and was the seat of the Earls of Mar.  It is owned today by Historic Scotland and is open to the public as a scheduled ancient monument.

Burt Castle: Burt Castle is a ruined castle located close to Newtowncunningham and Burt, County Donegal, Ireland.  Historically it was sometimes spelt as Birt Castle.  It is also known by the name O'Doherty's Castle, and should not be mistaken for O'Doherty's Castle near Buncrana.

Supporting paragraphs: New Slains Castle Old Slains Castle
Answer: New Slains Castle