South Korea
At the year's extreme tides, the sea pulls apart and a mud road opens between islands.
The sea separates, not gradually: the water tears back to expose a land bridge of mud and rock between Jindo and Modo. Hundreds of thousands walk it barefoot in a single festival week.
The Jindo sea-parting happens when extreme low tides expose a 2.8-kilometre path between islands, a limited window measured in about an hour of safe walking rather than a standing causeway. The island around the spectacle holds its own: the Jindo dog, a protected national breed; hongju, the gromwell-red rice liquor distilled here for four centuries; and battle history from Admiral Yi's straits. Southwestern weather, fog and wind included, is part of the island's character.
Family
Children can grasp the tides through the timed sea road, then shift to art or naval history when it disappears.
Friends
Coordinate the low-water window as a team and reserve the wider county circuit for after the crossing.
Couple
Share the brief exposed route, then choose one cultural site together instead of waiting all day for the sea.
Hongju, the gromwell-red island liquor, has been distilled here for four centuries.
When the sea road opens, the festival grounds fill with seafood stalls.

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Capuchins patrol the sand beneath dozing sloths where rainforest walks into the ocean.

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Tuvalu's largest island, where traditional sport te ano sends two woven balls flying at once.

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Jungle canals where green sea turtles haul onto black volcanic sand under a moonless sky.

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Manta rays circle the world's fourth-largest barrier reef, off villages the road barely reaches.

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Grass-covered royal tombs the size of hills rise unfenced among city streets.

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Lotus flowers choke the pond of a kingdom that fell fourteen centuries ago.

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At low tide a boulder path surfaces between the island and its lighthouse.

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Sesame smoke and midnight neon run right up to the walls of Joseon palaces.