What is it?

This is a journey to the loneliest corner of the British Empire — a scattering of volcanic specks in the South Atlantic, thousands of kilometres from anywhere, that together form one of the world's most improbable territories. On Saint Helena you step off a plane onto a cliff-edge runway and descend into Jamestown, a Georgian time capsule wedged into a rock cleft, where pastel shopfronts, a moated arch and 699 steps of Jacob's Ladder climb almost vertically into the hills; here Napoleon Bonaparte lived out his exile at Longwood House and was buried in a green valley before his body was repatriated, and here Jonathan the tortoise — hatched around 1832 and the oldest known living land animal — grazes the lawn of the Governor's residence. Ascension Island, 1,300km north, is a Martian landscape of clinker-black lava fields crowned by the improbably lush Green Mountain, a Victorian experiment in terraforming by Charles Darwin and Joseph Hooker; each summer thousands of green turtles haul themselves onto its beaches to nest. Tristan da Cunha, 2,400km to the south, is the most remote permanently inhabited island on Earth: some 240 people sharing seven surnames in a village gloriously named Edinburgh of the Seven Seas, beneath a smoking volcanic cone, with no airstrip and only a handful of ships a year. The soundtrack is wind, surf and seabirds; the taste is fresh-caught tuna, Saint Helena coffee (once served at Napoleon's table), and Tristan crawfish. Nowhere else can you combine imperial history, endemic wildlife and true end-of-the-world isolation in a single passport stamp.

Where is it?

The territory sits in the South Atlantic Ocean between South America and southern Africa: Saint Helena is roughly 1,900km west of Angola, Ascension a further 1,300km north-west, and Tristan da Cunha some 2,400km south of Saint Helena and 2,800km from Cape Town. Saint Helena is reached by a weekly Airlink flight from Johannesburg (often via Walvis Bay, Namibia), Ascension via RAF flights from Brize Norton or the occasional charter, and Tristan da Cunha only by sea — a six- to eight-day voyage from Cape Town aboard fishing or supply vessels, with around nine sailings a year. Aim for the southern summer (October to March) for calmest seas and Tristan landings, January to March on Saint Helena for whale sharks, and the same window on Ascension for nesting green turtles and hatchlings.

What makes it worth it?

Very few travellers ever make it here — Tristan da Cunha receives fewer visitors in a year than Everest Base Camp sees in a week — and that rarity is precisely the point. There is a particular kind of awe that comes from standing on a black lava shore knowing the nearest continent is a week's sailing away, and a particular kind of warmth in being welcomed by 'Saints' who wave at every passing car and know your name by day two. Visitors talk about the moment they swam alongside a whale shark the size of a bus in water 1,000 metres deep, or watched a green turtle labour up Long Beach under the stars, or simply sat in Napoleon's silent, empty tomb valley and felt history close in. 'It's not a destination, it's a pilgrimage,' is a phrase you'll hear often; another is that the islands 'rearrange your sense of scale — of the ocean, of time, of what community means'. Years later you'll remember the vertigo of Jacob's Ladder, the hush of Longwood House, and the sight of Tristan's volcano rising out of the swell after days of grey horizon — the moment you understood how remote 'remote' can be.

How accessible is it?

Physically this is undemanding — coastal walks, the 699 steps of Jacob's Ladder and the Post Box hiking trails ask for reasonable fitness but nothing technical — while logistically it ranks among the hardest trips on Earth. Saint Helena is now the easy one: a weekly six-hour flight from Johannesburg costs roughly £700–£1,200 return, guesthouses and self-catering run £50–£120 a night, and no visa is required (an entry permit is issued on arrival with proof of accommodation and insurance). Ascension requires a pre-approved entry permit and, for most civilians, a seat on limited military or charter flights, making it expensive and unpredictable; Tristan da Cunha demands written permission from the Island Council months in advance, medical and insurance documentation, a berth on one of roughly nine annual ships from Cape Town (around £1,500–£2,500 return for passage), and a homestay booking — and even then landings can be cancelled by swell. Budget three to four weeks minimum for a multi-island trip and £4,000–£8,000 all in; a Saint Helena–only visit of 7–10 days is far more achievable. Bring cash (the Saint Helena Pound is not available elsewhere), motion-sickness remedies, layered clothing for the Atlantic wind, and a tolerance for schedules that bend to weather and the sea.