Caerphilly Castle, nr Cardiff
A green lady flits from turret to turret so fearlessly that on one occasion some of the town boys almost caught her.
Ghostly soldiers also patrol the battlements.
Modern day security personnel will not venture up to the flag tower because they can smell perfume at all times.
Cardiff Castle, Cardiff
The second Marquess of Bute began restoration of Cardiff Castle but died in 1848. He is said to appear by walking through the fireplace of the library. He leaves this room by passing through a six-foot-thick wall into a corridor, then passes through the wall of the chapel into the room in which he died.
The main dining-hall of the castle is also disturbed. At precisely 3:45am heavy doors open and shut by themselves and the lights flash on and off.
A "faceless vision in a flowing grayish-white skirt" has also appeared in a stockroom close by, where things get disarranged.
Castell Coch, nr Cardiff
The young son of Dame Griffiths fell into a bottomless pool of dark water within the precincts and was never seen again. His mother was inconsolable and soon died from her grief. Her ghost restlessly continues to wander about the castle and its surrounding woods.
Conwy Castle, Conwy
One of Robert Wynn's successors at Plas Mawr had to leave Conwy to fight in a distant war. When the time was near for his return, his wife and child climbed the steep stair to the lookout tower. He was late, and the wife and child had to leave the tower because of darkness. On the way down she slipped, and, along with her child, fell to the bottom of the tower. They were taken to the lantern room. Doctor Dic was summoned but stated he could do nothing to save them. Fearing the wrath of the lord upon his return, the servant locked Dr. Dic inside the lantern room with the dying family. Upon the Master's return, the door was unlocked. He found the dead bodies of his wife and child, but not Dr. Dic. The Doctor was never seen again. The bereaved husband eventually went mad with grief and died soon after. His ghost still seeks the missing doctor in the lantern room and will continue to do so until he is found.
Dunraven Castle, Glamorgan
The castle was demolished after World War II. It was haunted by a little old lady in a blue dress who left behind her the smell of mimosa.
Roch Castle, Pembrokeshire
The ghost is the shade of Lucy Walters, first mistress of Charles II, who was born in 1630. She floats through locked rooms in a white dress and may be the cause of the noisy running footsteps which mysteriously disturb the sleep of guests on occasions.
Ruthin Castle, Denbighshire
There is a ghostly figure of a man in armor wearing only one gauntlet.
There is also a strange glowing ball of light.
The ghost of Lady Grey has been seen wandering the hallways of the castle.