What's a palace without a few ghosts?

Kensington Palace, where Prince William and his wife, Catherine, Duchess of Cambridge, live when they're in London, will be open for ghost tours for four nights during the Halloween weekend, Oct. 28 to 31, the palace confirmed.

Kensington is also where William lived with his mother, the late Princess Diana. many other royals over the centuries have lived there, too, some of whom are believed to be ghosts haunting the roughly 400-year-old palace, the Daily Mirror reported.

The Eerie Evening Tours of the Enchanted Palace will last an hour and half each evening g and cost about $33 per person. Kensington Palace is open every day for tours.

Kensington is said to be haunted by the spirit (among others) of the figure of Queen Mary, the consort of George V and William's great-great grandmother.

Stories collected in the warders' log book over the years include numerous reports of screams, bumps and ghostly sightings, the Mirror reported.

In Kensington, the royal couple shares an apartment cottage, which was acquired for the crown by the Stuart Queen Mary II and her husband, King William III, in 1689. When not in London, the Duke and Duchess live in a rented farmhouse in Wales near William's Air Force base, where he is a helicopter rescue pilot.