The India-Pakistan border is one of the most volatile frontiers in the world
On the 20th anniversary of the fall of the Berlin Wall, BBC Mundo looks at barriers which are still standing - or have gone up since - around the world.
The border between India and Pakistan is one of the most volatile on the planet.
Walls, barbed wire fences and barricades stretch almost half the 2,900km (1,800 mile) boundary line.
Delhi has said it intends to extend the barrier along almost the whole border.
At the end of the 1980s, India began erecting barriers in the states of Punjab and Rajastan, saying they needed to combat terrorism.
An additional cause of tension is the use of barbed wire fences combined with mines and other high-tech devices along almost all of the so-called "Line of Control", the de facto border between Indian- and Pakistani-administered Kashmir.