Experience 365 days of wonder and curiosity with the greatest unexplained mysteries of all time! Explore the world's most mystifying occurrences, from the Alcatraz breakout to the Zodiac killer. Packed full of cryptic crimes, strange disappearances, and inexplicable events, this 2021 boxed calendar features astounding unsolved mysteries across the ages! This day-by-day record of fascinating unsolved mysteries is brought to you by one of the most relied-upon and best-respected sources of historical material, HISTORY®. Perfect for true crime lovers and trivia fans alike, this on this day calendar of events is the ideal gift for fans of strange but true mysteries, unsolved history, and the perfect holiday stocking stuffer or mini gift for women and men who already have everything else! Additional details: 4.25" x 4.5" page trim size with protective 5" x 5" outer box Recyclable plastic easel backing for perfect display on tabletop or desk Environmentally responsible, FSC certified paper Daily calendar with easy, tear-off pages