Micronesia (Federated States of)

Chuuk's underwater museum was created in two days: Operation Hailstone, the US carrier strike of 17-18 February 1944, caught the Japanese Combined Fleet's anchorage at rest and sent more than 60 ships and hundreds of aircraft to the lagoon floor, where eighty years of coral growth have turned a battlefield into the world's most celebrated wreck-diving destination. The fleet grades itself naturally: the Fujikawa Maru — Zero fighters still crated in its holds — and the coral-gardened Shinkoku Maru sit shallow enough for relaxed recreational profiles; the deeper San Francisco Maru, its deck cargo of tanks and mines intact at technical depths, is the famous prize for trained divers. Operators on Weno and two liveaboards work the lagoon year-round in warm, generally calm water. The wrecks are war graves and protected historic sites in one — penetration is guided, artefacts stay where they lie, and the Japanese memorial above Eten island frames what the lagoon actually holds.

Yap runs on two economies of wonder. In the water, resident reef mantas cycle through the cleaning stations of the Mi'il and Goofnuw channels — December to April is the near-certain season — gliding over divers' bubbles in encounters reliable enough to build a trip around. On land, the rai stone money still matters: the great limestone discs, quarried on Palau and sailed 400 km home by canoe, derive their value from their provenance — the harder the voyage and the more storied the journey, the greater the worth, a ledger kept orally even when a disc is too large to move and simply changes owners where it stands. Village 'stone money banks' line the paths under palms. Yapese custom is the Pacific's most intact: visits to villages go with local guides and permission, traditional dress remains common at ceremonies, and betel nut is the social currency offered before conversation. Ask before photographing — here that rule is law, not courtesy.

Off Pohnpei's southeast reef flat stands the Pacific's most astonishing ruin: Nan Madol, ninety-two artificial islets built from naturally hexagonal basalt columns stacked like colossal log cabins, threaded by tidal canals — the ceremonial seat of the Saudeleur dynasty, raised between the 10th and 16th centuries and UNESCO-listed since 2016. How multi-tonne columns were quarried across the island and floated here remains genuinely unresolved, which Pohnpeian tradition answers with the sorcerer-brothers who flew the stones into place. Visiting has its own choreography: the site sits on private and sacred land, so go with a local guide, expect small landowner fees, and time the trip to the tides — high water lets kayaks and boats thread the canals, low tide means wading the reef flat to the towering walls of the Nandauwas royal compound. Pohnpei rewards the rest of a stay too: waterfall hikes into the cloud-forest interior, sakau (kava) sessions at nakas in the evening, and the wettest, greenest island in the FSM all around.

Kosrae is what the Pacific looked like before itineraries found it: a near-circular volcanic island whose ridgeline — the 'Sleeping Lady', reclining against the sky — drops through untouched rainforest to mangrove channels and a fringing reef in conservation-grade condition, protected by a marine park system and the absence of crowds that elsewhere requires regulation to simulate. Diving is walls and hard-coral gardens with visibility the equal of anywhere in Micronesia and dive boats that rarely see another operator; the Lelu ruins — a walled royal city of basalt, the 13th-14th-century counterpart to Nan Madol — sit half-swallowed by jungle at the edge of town, wanderable with a local guide and almost always empty. One cultural note shapes every visit: Kosrae is devoutly Christian, and Sunday is genuinely observed — shops close, boats stay in, and the singing from the churches is itself worth arranging a Sunday for. Hiking, kayaking the channels and the surf break at the airport reef fill the rest.

Beyond the four state centres lie the FSM's outer atolls — Ulithi, Woleai, the low coral rings of Yap and Chuuk states — where travel stops being tourism and becomes passage. Ulithi's vast lagoon, briefly one of the largest naval anchorages on earth in 1944-45 when the US Pacific Fleet staged here, today hosts a handful of visitors, turtle-nesting islets and communities that navigate, weave and fish much as their ancestors did; the Yap outer islands are among the last places where traditional Carolinian celestial navigation is still taught. Access is the adventure: occasional small-plane charters and the government field-trip ships that circle the atolls on loose schedules, carrying supplies, passengers and patience in equal measure. Visits need advance permission arranged through the state governments, gifts and cash (there is nothing to buy and nowhere to change money), and flexible return dates. For the traveller who has been everywhere, this is the rare somewhere that almost nobody has.