Horsburgh Castle is a small 16th century stone L-plan tower house, founded by the Horsburgh family. Crowning a large prominent mound on the north bank of the River Tweed, the remaining two storeys of the tower were once harled. The east walls and the east end of the south wall are missing and the only feature of interest is an original slit-window in the west wall of the basement. The wing contained a turnpike stair and the whinstone rubble walls have been partially rebuilt, to consolidate the ruined shell. 2 miles north-west is the County Hotel and 4 miles south-east is Traquair House.