They are Ducie Island, which is itself a barren and incredibly remote atoll belonging to the Pitcairn Island chain; the rocky Motu Nui of Chile; and Antarctica's Maher Island, which is so small and remote it wasn't even discovered until the 1940s. Point Nemo was first discovered in 1992...
Ponant Cruises sails to Point Nemo. Smithsonian Journeys are now offered by Ponant. Nemo Point is a destination of Ponant Cruise Line