Reykjavik - Dublin

Reykjavik, the world's northernmost capital, distils the entire improbable beauty of Iceland into one compact, creatively charged city. The soaring basalt columns of Hallgrímskirkja dominate a skyline of primary-coloured rooftops, while the Harpa Concert Hall shimmers beside the harbour like a captured aurora. Day trips from the city unlock the Golden Circle's geysers and Geysir hot spring, the black sand beaches of Vík, and the ethereal glacier lagoon at Jökulsárlón. Geothermal pools — from the legendary Blue Lagoon to intimate neighbourhood hot pots — offer warmth year-round. June and July bring the bewitching midnight sun.

Heimaey is Iceland's volcanic island where the dramatic 1973 eruption story, the world's largest puffin colony of one million breeding pairs, and the children's annual puffling rescue create one of the North Atlantic's most extraordinary port experiences. Visit May through August via Lindblad or Windstar for Eldfell volcano hikes, the Eldheimar Museum's excavated homes, and the harbor approach through a channel literally reshaped by eruption.

Djúpivogur is an intimate Icelandic fishing village on the eastern coast where thirty-four stone egg sculptures line the harbor, Vatnajökull glacier dominates the horizon, and puffin colonies nest on nearby Papey island. Visit June through August via Seabourn or Viking for reindeer sightings, glacier views, and the quiet eastern Iceland that rewards travelers who venture beyond the Golden Circle.

The Orkney Islands are Europe's densest concentration of prehistoric monuments, where Skara Brae's five-thousand-year-old Neolithic village and the Ring of Brodgar predate both Stonehenge and the pyramids in a landscape layered with Norse cathedrals and dramatic sea stacks. Visit June through July via Hapag-Lloyd or Princess Cruises for the 'simmer dim' midsummer twilight that dissolves the boundary between present and Neolithic past.

Westray is an emerald Orkney island with five thousand years of continuous habitation, home to the "Westray Wife" — Britain's earliest carved human face — and one of the UK's largest seabird colonies at Noup Head. Visitors should explore the Neolithic Links of Noltland, taste award-winning Westray Wife cheese, and watch puffins on the dramatic sea cliffs. June through August offers the longest days and warmest weather.

Stornoway, the sheltered harbour capital of Scotland's Isle of Lewis in the Outer Hebrides, offers an extraordinary blend of Norse heritage, Victorian architecture, and raw Atlantic beauty. Visitors should not miss the twelfth-century Lewis Chessmen at Museum nan Eilean inside the restored Lews Castle, nor the chance to taste the island's PGI-protected Stornoway black pudding at its source. The sailing season from May through September delivers the longest daylight hours and mildest conditions, with late June offering near-endless twilight that bathes the ancient Callanish Standing Stones in an ethereal glow.

Sound of Mull in United Kingdom blends maritime heritage, dramatic coastal scenery, and the understated warmth of the British Isles into a deeply rewarding port of call. Essential experiences include walking the coastal paths and sampling the region's thriving artisanal food scene. The most reliable conditions arrive June through September, when long northern days and mild temperatures make exploration a pleasure, though the atmosphere is compelling in any weather. Cruise lines including HX Expeditions feature this port on their most compelling itineraries. Whether you have a few hours or a full day, the port rewards exploration at every pace and in every direction.

Oban, Scotland’s Gateway to the Isles, is a charming harbor town on the west coast where world-class seafood meets Hebridean island adventures. Must-dos include tasting langoustines at the famous Seafood Hut, visiting sacred Iona and Fingal’s Cave on Staffa, and sampling Oban Distillery’s maritime single malt. Visit May through September for the best weather and longest days to explore the Inner Hebrides.

Peel is a characterful fishing town on the Isle of Man, dominated by a Viking-era castle on St Patrick's Isle and home to the island's last traditional kipper smokehouse operating since 1882. Must-dos include tasting pan-fried queenies and oak-smoked kippers, exploring the castle ruins, and riding the island's heritage steam railway. May through September offers the mildest weather for exploring.

Liverpool, an historic port city, is renowned for its unique blend of vibrant culture and rich maritime heritage. Must-do experiences include sampling authentic Scouse and exploring the Three Graces along the waterfront. The best season to visit is during the mild summer months, when festivals and events enliven the city’s atmosphere.