From the late eighteenth century, castles became tourist attractions. Blair Castle was a popular location on account of its landscaped gardens, and Stirling Castle because of its romantic historic connections. Tours became increasingly popular during the nineteenth century, usually starting at Edinburgh and then spending up to two weeks further north, taking advantage of the expanding rail and steamer network. Blair Castle remained popular, but additional castles joined the circuit, with Cawdor Castle becoming popular once the railway line reached north to Fort William. Scottish castle guidebooks became well known for providing long historical accounts of their sites, often drawing on the plots of Romantic novels for the details. Sir Walter Scott's novels set in Scotland popularised several northern castles, including Tantallon, which was featured in the poem "Marmion" (1808).