Crocker Land was the name Robert Peary

Robert Peary

Robert Edwin Peary, Sr. was an American explorer who claimed to have been the first person, on April 6, 1909, to reach the geographic North Pole...

 gave to a mass of land which he believed he saw in the distant northwest from the summit of Cape Thomas Hubbard

Cape Thomas Hubbard

Cape Thomas Hubbard is a headland located in the northern Canadian territory of Nunavut. Projecting into the Arctic Ocean, it is situated on the northern tip of Axel Heiberg Island, from Etah, Greenland.-History:...

, during a 1906 expedition. Peary estimated the landmass to be 130 miles away at about 83 degrees N, longitude 100 degrees W. It is now known there is no land at that location and what Peary actually saw was almost certainly a Fata Morgana

Fata Morgana (mirage)

A Fata Morgana is an unusual and very complex form of mirage, a form of superior mirage, which, like many other kinds of superior mirages, is seen in a narrow band right above the horizon...

 mirage.

In 1913, Donald Baxter MacMillan organised the ill-fated Crocker Land Expedition

Crocker Land Expedition

The Crocker Land Expedition was an ill-fated 1913 expedition to investigate Crocker Land, a huge island supposedly sighted by the explorer Robert Peary from the top of Cape Colgate in 1906...

 and set out to look for Crocker Land. Needless to say, it was not found. The expedition was a disaster. The captain of the first ship became drunk and ran aground on the rocks. Later an Inuit guide was deliberately shot and killed by one of the expedition members under suspicious circumstances. The expedition eventually became stranded and was not rescued until four years later.

Although the concept of Crocker Land has been thoroughly disproved by modern aerial photography beginning with the 1937-38 MacGregor Arctic Expedition

MacGregor Arctic Expedition

The MacGregor Arctic Expedition was a privately funded expedition which set out to reoccupy Fort Conger, Ellesmere Island, Canada, a site within flying distance of the North Pole...

, some pseudo-scientific organizations still try to present a case for its possible existence.