St Kilda is a collection of spectacular sea stacks and cliff-bound islands about 45 miles west of North Uist. The largest island, Hirta, measures only 2 miles by 1 mile, with huge cliffs along most of its coastline. Owned by the National Trust for Scotland (NTS), the islands are a Unesco World Heritage Site and are the biggest seabird nesting site in the North Atlantic, home to more than a million birds.
Hirta is the only island on which visitors can land. In addition to watching the bird life, you can explore the remains of the island's only settlement at Village Bay, where there's a ranger's office and small museum, and climb to the summit of Conachair (430m), the island's highest point.