London (Southampton) to Reykjavik

Southampton, England's storied ocean liner capital on the southern coast, carries an indelible maritime identity — this is the port from which the Titanic departed and from which the Queen Mary 2 still sails in grandeur today. The medieval Bargate and City Walls speak to a history stretching back to Roman times, while the SeaCity Museum tells the story of the great liners with moving intimacy. Day excursions reach Winchester's magnificent cathedral, the stately rooms of Beaulieu, and the primeval wilderness of the New Forest — where ancient ponies still roam freely. Spring and summer offer the most pleasant conditions for exploring the region.

Falmouth is Cornwall's cultural and maritime heart, set on one of the world's finest natural harbors with a superb maritime museum, Henry VIII's Pendennis Castle, and access to subtropical gardens and the Helford River's hidden creeks. Must-dos include Fal oysters, the National Maritime Museum Cornwall, and boat trips to St. Mawes. May through September offers the warmest conditions for exploring Cornwall's stunning coastline.

Cobh is a historic harbour town in Cork, Ireland, famed as the Titanic's last port of call and the departure point for 2.5 million Irish emigrants. Must-dos include visiting the Cobh Heritage Centre and Titanic Experience, admiring St. Colman's Cathedral and its 49-bell carillon, and exploring the English Market in nearby Cork. May through September offers the longest days and best weather for this emotionally rich port.

Waterford is Ireland's oldest city, founded by Vikings in 914 AD, featuring a magnificently restored medieval quarter, the world-famous House of Waterford Crystal, and three museums housing the finest medieval collection in the country. Must-dos include Reginald's Tower, crystal-making demonstrations, and tasting the city's unique blaa bread rolls. May through September offers the warmest weather, with September often bringing surprise Indian summer days.

Holyhead is Wales's maritime gateway on Holy Island, offering dramatic cliff walks to South Stack Lighthouse with its puffin colonies, plus access to Anglesey's Neolithic burial chambers and Edward I's Beaumaris Castle. Must-do experiences include tasting Halen Môn sea salt and lobster at coastal restaurants, exploring Bryn Celli Ddu's ancient passage tomb, and walking the Victorian breakwater. May through September is best, with summer bringing puffins and the longest days.

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.

Belfast, Northern Ireland’s capital, is a vibrant port city renowned for its rich shipbuilding heritage, highlighted by the Titanic Belfast museum. Must-do experiences include exploring the historic Cathedral Quarter and tasting traditional dishes like Irish stew and soda bread at St. George's Market. The best season to visit is during the spring and summer when the city comes alive with festivals and outdoor events.

Tórshavn is the Faroe Islands' tiny capital city, where a thousand-year-old Viking parliament site, turf-roofed timber houses, and two-Michelin-starred dining coexist in one of the North Atlantic's most atmospheric settings. Visit from May through September for extraordinary hiking, midnight twilight, and a cultural scene that defies the city's diminutive size.

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.

Ísafjörður is the cultural and historical capital of Iceland's remote Westfjords, a dramatic fjord-side settlement where centuries of fishing heritage meet stark Arctic grandeur. Visitors should not miss the communal seafood feast at Tjöruhúsið restaurant and a journey to the surreal red sands of Rauðasandur beach near Patreksfjörður. The optimal visiting window is June through August, when nearly perpetual daylight illuminates the encircling mountains and the town's vibrant cultural calendar reaches its peak.

Grundarfjörður is a fishing town at the base of Kirkjufell, Iceland's most photographed mountain, and the gateway to the Snæfellsnes Peninsula—dubbed "Iceland in miniature" for its concentrated geological diversity. Must-dos include photographing Kirkjufell with its companion waterfall and exploring Snæfellsjökull, the glacier volcano from Jules Verne's novel. June and July offer midnight sun and the most reliable weather for peninsula exploration.

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.