Throughout his life, Irish-born writer Elliot O'Donnell reportedly experienced several encounters with ghostly beings, including one run-in with a spirit in Dublin that almost proved fatal. Inspired by these experiences, O'Donnell devoted his life to hunting and documenting specters. The collection Ghostly Phenomena brings together an impressive batch of ghost-related folktales, sightings, and anecdotes.

Is this world all that exists, or are there one or more invisible dimensions in the universe that also harbor sentient beings? In The Astral Plane: Its Scenery, Inhabitants and Phenomena, esoterica expert C.W. Leadbeater brings together centuries of information about one much-hypothesized-about realm, the so-called astral plane. Whether you are a believer in unseen phenomenon or a skeptic, it makes for a fascinating read.