Check out these events, both spooky and sweet, coming your way this Halloween.

"What's So Scary" Event at the Harvard Museum of Natural History

Oct. 29, 1 to 5 p.m. Free for Harvard ID holders and one guest.

Venture into the spookier side of natural history by exploring a special Halloween gallery featuring bat skeletons, wolf skulls, and owl feathers. See a live tarantula, watch a 3D documentary about bats, and design a bat or owl mask. Attending in costume is encouraged.

Boston Ghosts and Gravestones Tour

Every day, tours on the half-hour from 7 to 9 p.m. Departs from Atlantic Ave. and State Street. $34.20. Call ahead for reservations.

Embrace your inner gravedigger on a trolley tour of Boston's premier cemeteries.

Visit the spirits of John Hancock, Class of 1754; Paul Revere; and Samuel Adams, Class of 1740, at the Granary Burying Ground. Then see Copp's Hill Burying Ground—the resting place of Cotton Mather, Class of 1678, whose soul might still be tormented by his involvement in the Salem Witch Trials.

Beacon Hill with a BOO!

Oct. 31, 5:30 p.m. Departs from the Massachusetts State House on Beacon Street. $20.

Wear your costume and comfortable footwear to explore the darker side of the Beacon Hill neighborhood with a leader from the Boston by Foot tour group. If you're lucky, you might encounter a ghost or two.

Psycho-Delic! A Thriller of a Halloween Party

Oct. 29, 8 p.m. to midnight. José Mateo Ballet Theatre. $25 for ages 21-35.

Little-known fact: ballerinas throw the best parties. This bash will include cocktails, dances, a prize for the best costume, a raffle, and a mysteriously titled "apparition" performed by the ballet company's dancers.