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At Breachacha on the southern coast of southwestern Coll there are not one but two castles.
The older one, dating originally from the C15th is nearer the coast than the 'new' Breachacha Castle which was constructed in the mid C18th. The two castles are about 140 metres apart.
A little way to the south of the two castles at a location called Carpach is the Category 'B' listed NM1553 : Coll - Breachacha Steading and Farmhouse which forms something of a group with them.

Old Breachacha Castle:
This 4-storey, rectangular-plan tower house with garret and parapet wall and tall curtain wall enclosing a courtyard was built originally in the C15th for the MacLeans of Coll, but had fallen into ruin after the construction of the 'new' castle in 1750. However it was completely restored in the 1960s. Attached to the SE corner of the tower is a tall (but not as tall as the main tower house) cylindrical tower. The castle is privately owned and not open to the public.
It is HES Category 'A' listed: Link
See also Canmore: Link

New Breachacha Castle (aka Breachacha House)
The new castle was originally built around 1750 but was enlarged and raised in height in 1856.
The main central section of the house comprises a 4-storey, 3-bay, symmetrical, square-plan Gothick-Baronial building with a piended (hipped) roof. This is linked on either side to a 2-storey, 3-bay pavilion. The building lay empty from the 1930s until the 1980s and it fell into a poor state. However like its elderly neighbour it too has been restored and is now advertised as a luxurious place to stay - see their website here: Link
It is also HES Cat 'A' listed: Link
And see Canmore: Link

The Isle of Coll lies in the Sea of the Hebrides to the west of the much larger island of Mull, and immediately to the northeast of its neighbour, Tiree (Tiriodh).
Coll is much hillier and far less suitable for agriculture than Tiree, though the latter has slightly higher hills at its western edge whereas Coll has a distribution of c.60m hills over much of its terrain. Its highest point, Ben Hogh, achieving just 106m (348'). This difference in topography results in Coll having less than a third of the population of its neighbour.
Whereas Tiree is criss-crossed by a network of roads and lanes, Coll only really has one major road with a few (dead-end) 'branches'. Like Tiree, it is famed for its beaches, especially along its northwest coast and the massive expanse of dunes at the southwest of the island between Feall and Crossapol Bays.
Just off the SW coast is the small uninhabited island of Gunna (69ha, 170 acres (c.¼ mile²)) and off its NE coast a collection of uninhabited islets, the "Cairns of Coll" the largest of which is Eilean Mòr (c.18ha, 45 acres)
Statistics (Coll main island)
Area: 7,685ha (29.67 miles²)
Population: 195 (2011 census)
Density 2.537/km² (6.572/mile²)
Highest Point: Ben Hogh, 106m (348')
Principal settlement: Arinagour (with about ¼ of the island's population)