The Black Tower is one of the four watchtowers of the Brașov Citadel, built as an independent fortress outside the citadel walls. The tower, a good eleven meters high, stands not far from the Blacksmiths' Bastion on a rock on the Warta Hill. Its walls are two meters thick at the base and have six loopholes on each side. In the past, the tower was connected to the citadel by a movable bridge leading down to the Blacksmiths' Bastion (Graft Bastion). The tower was built in the 15th century, at the same time as the White Tower. Its first documented mention dates back to 1541. The original roof is no longer preserved, having been destroyed by lightning in 1559 and by fire in 1689. The fire blackened the walls of the tower, giving it its current name. It was destroyed again by lightning in 1696, but was rebuilt.