Rosslyn Chapel is still famous for its history and beauty, but now it attracts thousands of Da Vinci Code followers as it is featured in the film (visit in the morning to avoid them). The stained windows and vaulted ceilings are a marvel - just watch out for the many ghosts who plague the chapel.
Rosslyn lies seven miles to the south of Edinburgh. Take the Lothian bus 15A or First bus 62 from Edinburgh city centre to Rosslyn. The chapel itself is a 3-4 min walk from the bus stop in Rosslyn village.
www.stuckonscotland.co.uk/edinburgh/rosslyn-information.html
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I would also combine it with a walk through Rosslyn valley, with the river, and a visit to Bilston Road Protest Camp for a cup of tea and their free open cafe. Take the 37 to Loanhead and walk the rest, starting from the cycle/footpath.