Sweden

Stockholm's medieval old town on Stadsholmen island, with a largely intact 13th-century street plan and the densest concentration of historic buildings in northern Europe.

A 1,700-metre suspension bridge spanning the Ångermanälven estuary in Ångermanland, crossing a landscape shaped by post-glacial rebound and documented since the 17th century.

A hotel built from ice blocks cut from the Torne River, rebuilt each winter in Jukkasjärvi, 17 km from Kiruna in Swedish Lapland, with year-round suites in the permanent structure.

Sweden's oldest functioning cathedral, begun in 1080, with a Romanesque exterior and a renowned astronomical clock installed around 1424, still in daily operation.

A world-class museum built around the intact recovered hull of the Vasa, a 64-gun Swedish warship that sank on its maiden voyage in 1628 and was raised in 1961 after 333 years on the seafloor.

A medieval walled town on the Baltic island of Gotland, with a largely intact 13th-century city wall and an extraordinary collection of ruined Gothic churches in the island's interior.