The centerpiece of the Urquhart Castle is the Grant Tower. This five-level, 40 foot stone keep was named after John Grant. In 1509, James IV of Scotland gave Grant a lifetime lease on the property in return for repairing and maintaining it. The ruins are a major tourist attraction. After crossing over the bridge, you can walk around the 14th century walls enclosing the Nether Bailey (courtyard), climb the tower and explore the foundations of its past buildings and rooms.