1. St. Magnus Cathedral, located in Kirkwall, Orkney, is a magnificent red sandstone cathedral that was founded in 1137 by the Viking Earl Rognvald Kolsson in honor of his uncle St. Magnus. The cathedral is considered one of the finest examples of Romanesque architecture in Scotland. It features a distinctive round tower with a conical spire, beautiful stained glass windows, and intricate stone carvings.

2. St. Magnus Cathedral is open to visitors daily, with varying hours depending on the season. It is recommended to check their website or call ahead for the most up-to-date information. If available, you can reach them at +44 1856 874894.

3. There is no entrance fee to visit St. Magnus Cathedral, however, donations are appreciated to help with the upkeep of the historic site. The cathedral is easily accessible by public transportation or by car, with parking available nearby. Visitors can also explore the beautiful town of Kirkwall and its surrounding area after visiting the cathedral.