A Romanesque church can be seen at the Brough of Birsay, a tidal island with the remains of an early Pictish and then Norse settlement. (Brough is another word for burgh.) The collection of roofless stone structures on the tiny island, close to Birsay, are accessible only at low tide by means of a concrete path that winds across the seaweed-strewn bay. The path is slippery, so boots are essential. To ensure you won't be swept away, check the tides with the tourism office in Kirkwall or Stromness before setting out.