Bermeja Island located north of the Yucatan Peninsula - first appeared on maps in 1539. Removed by 1997. Conspiracy theorists claim the CIA destroyed the island to expand the economic zone allotted to the US.
Bracile Island located off the west coast of Ireland - first appeared on maps in 1325. Removed by 1865. According to Irish legends, the island is cloaked in mist and only appears for a single day every 7 years.