The power of walls
In the wake of the migration crisis, more border barriers are going up in Europe - and that's a worldwide trend. Unlike the Berlin Wall, they're being built to keep others out.
Schengen closes frontiers
The Hungarian government, led by Prime Minister Viktor Orban, has had a fence built along the border with Serbia and also had one erected along the border with its EU neighbor, Croatia. Most of the refugees traveling from Greece through the Balkans actually want to move on to Austria and Germany.
Melilla - A European outpost
The borders to Melilla and Ceuta, the Spanish enclaves in Morocco, are considered to be among the most modern border management systems in the world. Six-meter-high fences surround the cities. Equipped with barbed wire, infrared cameras and motion and sound sensors, these fences have been built to keep out refugees from Africa.
The divided island
The zone known as Cyprus' "Green Line" consists of barbed-wire fences, debris, watchtowers and wall segments. At a length of more than 180 kilometers, it divides the island into the Turkish part to the north and the Greek part to the south. Guarded by thousands of soldiers on both sides, Nicosia has been the last divided capital in the world ever since the fall of the Berlin Wall.
The 'Tortilla Wall'
Nearly 20,000 police officers working for the United States Border Patrol guard the US - Mexican border. The 'Tortilla Wall' is 1,100 kilometers (700 miles) long. The border management system boasts video cameras and infrared cameras, night vision devices, and motion and ground sensors. It serves as a deterrent for illegal crossings.
The Holy Land - split in two
There are few checkpoints where people can cross the border between Israel and the Palestinian territories, like here in Jerusalem. The fortifications are supposed to prevent Palestinian terror attacks. Despite the border and its guards, however, Palestinians in the Gaza Strip repeatedly manage to transport weapons and other goods through self-dug underground tunnels.
Korea's demilitarized zone
It is considered to be the most heavily guarded border in the world: a million mines, barbed wire and watchtowers separate South Korea from communist North Korea. A four-kilometer-wide (2.4 miles) demilitarized zone into which entry is prohibited runs along each side of the 248-kilometer-long border. It was established after the three-year Korean War in 1953.
'Peace Lines' in Northern Ireland
A total of 48 "Peace Lines" separate Protestant from Catholic neighborhoods in Northern Ireland. In the capital Belfast, the barriers consist of a seven-meter-high wall made of bricks, barbed wire, concrete and patch grids. The wall has passages for pedestrians and gates for motor vehicles. The gates are closed at night.
The Great Wall of India
It is the longest border in the world. India is using the 4,000 kilometers (2,500 miles) of barbed wire to shut out Bangladesh, which is regarded as a safe haven for terrorists. The actual border is up to two meters high and reinforced by tripwires that can energize the fence. About 50,000 troops protect the border.
Berlin - the wall that came down
The Berlin Wall has a place in world history. Known for its dangerous "death strip," it came down on November 9, 1989. The fall of the Wall heralded the end of the Cold War and subsequently, Germany was reunified. The appeal of this historic event, however, has not inspired other countries to avoid building physical borders and isolating themselves.