In April 1925 the British explorer Colonel Percy Harrison Fawcett, aged 57, walked into the Mato Grosso region of the Brazilian Amazon with his 21-year-old son Jack and Jack’s friend Raleigh Rimell, searching for the ruins of a vanished civilisation he had named “Z.” None of the three was seen again by the outside world. Their last confirmed message was sent from a place Fawcett called Dead Horse Camp on 29 May 1925; after that the jungle closed over them. Despite decades of searches, books, expeditions and rumours, no remains, camp or grave has ever been confirmed, and the fate of the three men remains formally unresolved.
Fawcett was an experienced Royal Artillery officer turned surveyor who had mapped stretches of the Bolivia–Brazil frontier for the Royal Geographical Society from 1906 onward and had crossed the Amazon’s wilds repeatedly. By 1914 he had become convinced, partly from a colonial-era document held in Brazil’s national library (the so-called “Manuscript 512”) and partly from his own theorising, that a complex lost city — stone-built and ancient — lay undiscovered in the Mato Grosso. The 1925 expedition was his attempt to reach it, deliberately small and lightly equipped on the theory that a tiny party could move quietly and live off the land where a large one would provoke or starve.
That same theory left almost no margin and no rescue. Fawcett travelled with only his son and one young companion, swore his backers to give no relief if he failed, and pressed beyond the last point where anyone could follow. After Dead Horse Camp the record is silence broken only by Indigenous oral testimony. The most credible accounts trace the party into the territory of upper-Xingu peoples; later claims that the Kalapalo killed them were investigated and not substantiated, and forensic tests on bones once attributed to Fawcett excluded him. What is certain is that three men disappeared, and that the searches sent after them cost further lives.
In the autumn of 1848 the Prussian-born naturalist Ludwig Leichhardt led a party of seven men out of the Darling Downs of eastern Australia, intending to cross the continent from the Condamine River in Queensland to the Swan River on the far west coast — a traverse of perhaps 5,000 to 6,000 kilometres through country no European had seen. The party was last sighted on 3 April 1848 at Allan Macpherson’s Cogoon station, near present-day Roma. Leichhardt, his four European companions, his two Aboriginal guides, and his herd of livestock then rode west and were never reliably seen again. No bodies, no graves, no camp with human remains, and no confirmed relic of the men themselves has ever been found. The disappearance is the most enduring unsolved case in the history of Australian exploration.
Leichhardt was not a novice. His first expedition of 1844–45 had carried him and his companions nearly 4,800 kilometres overland from Jimbour, on the Darling Downs, to the British outpost at Port Essington on the northern coast, arriving on 17 December 1845 after the party had long been given up for dead. That journey made him a celebrity in Sydney and across the colonies. A second attempt, begun in December 1846, was a failure: heavy rain, malarial fever and near-famine forced the party back after roughly 800 kilometres and some five months. The 1848 expedition was his third venture and his most ambitious — and the one from which no member returned to tell what happened.
The party comprised Leichhardt himself; four Europeans — Adolph Classen, Arthur Hentig, Donald Stuart and Thomas Hands; and two Aboriginal guides from the Port Stephens district, Wommai and Billy Bombat, whose knowledge of country and skill in finding water and game would have been the expedition’s most valuable asset. They drove seven horses, twenty mules and fifty bullocks, a herd intended to feed the men over a journey of many months. Their fate is unknown. The most plausible reconstructions, drawn from scattered marked trees and a single authenticated relic, hold that the party penetrated deep into the continent — possibly as far as the desert country near the Western Australian border — before perishing of thirst, starvation, flood, disease or conflict, in some combination the record cannot resolve.
Because nothing was witnessed and nothing recovered, this is a dossier about an absence. What can be stated with confidence is narrow: the route attempted, the men who attempted it, the date they were last seen, and the long failure of every search to find them.
Friedrich Konrad Hornemann, a young German theology student sponsored by Britain’s African Association, became in 1798 the first modern European known to cross the northeastern Sahara, travelling in disguise from Cairo to the Fezzan in present-day Libya. He then pressed on alone toward the Niger and disappeared into the interior of the central Sudan, dying of disease at the town of Bokane in the Nupe country — now in northern Nigeria — around February 1801, at about twenty-eight. No European witnessed his end, and confirmation of his fate did not reach the outside world for years.
Born in Hildesheim in 1772 and trained at Göttingen, Hornemann offered himself to the African Association in 1796 and was equipped to attempt the unsolved geographical problem of the age: the course and termination of the Niger River. He reached Cairo, learned Arabic and the manners of a Muslim traveller, and on 5 September 1798 joined a returning pilgrim caravan, disguised under the name Yusuf. He crossed the desert by way of the Siwa oasis and reached Murzuk in the Fezzan on 17 November 1798. From there he travelled to Tripoli and sent his journals back to London — the one substantial record of his work that survives.
Then he turned south, back into the desert and beyond the edge of European knowledge, and the documented trail ends. He is reported to have travelled with the Bornu caravan, reached the Hausa country, and pushed on toward the Niger before sickening and dying at Bokane in Nupe. Because he travelled alone among local caravans, with no European companion left alive to report, the details of his death are thin and second-hand: a notice that reached Murzuk only in 1819 recorded that the traveller had gone to “Noofy” (Nupe) and died there. He had probably come within reach of solving the Niger question; the answer, like the man, was lost in the interior.
The Coronado expedition marched out of Compostela in New Spain on 23 February 1540 under Francisco Vázquez de Coronado, governor of Nueva Galicia, to seize the “Seven Cities of Cíbola” — wealthy cities reported by the friar Marcos de Niza to lie north of Mexico. It was a large armed enterprise: roughly 400 European men-at-arms, mostly Spaniards, together with an estimated 1,300 to 2,000 Indigenous Mexican allies, four Franciscan friars, enslaved people, servants, and great herds of horses and livestock. Over more than two years it crossed what is now Arizona, New Mexico, Texas, Oklahoma and Kansas. It found no gold. It returned in 1542 a financial and strategic ruin, and most — though far from all — of those who set out came back alive.
What the expedition found instead of cities of gold was, at Cíbola, the Zuni pueblo of Hawikuh: a rock-and-adobe town that the Spaniards stormed and took on 7 July 1540, wounding Coronado in the assault. The “seven cities” were farming villages of earth and stone. Pressed for the wealth they had been promised, the Spaniards quartered themselves on the Tiwa pueblos of the Rio Grande for the winter of 1540–41, demanding food, clothing and shelter, and the abuses — including the sexual assault of a Puebloan woman — provoked a revolt. The Spanish response was the Tiguex War: under García López de Cárdenas they besieged and destroyed pueblos, and at Arenal burned to death an estimated thirty captives who had tried to surrender. Hundreds of Tiwa people died and a dozen or more pueblos were ruined or abandoned, in what is reckoned the first named war between Europeans and Native Americans in the present-day United States.
Lured on by an enslaved Plains captive the Spaniards called “the Turk,” who described a rich kingdom called Quivira on the eastern plains, Coronado marched out across the Llano Estacado in 1541 and reached Quivira — grass-house villages of the Wichita people near present-day Kansas — late that July. There was no gold there either. Concluding he had been deliberately misled, Coronado had the Turk garroted. A fall from his horse left him injured, and in spring 1542 the broken expedition turned back for Mexico, arriving that autumn. Coronado was later tried over the conduct of the expedition and acquitted; he died in 1554. The march mapped a vast stretch of the continent’s interior, but it did so at the cost of Puebloan lives and towns, and it is honestly read not as an epic of discovery but as a failed conquest.