Tunnels

Smoke rises as a house is blown up during a military operation by Egyptian security forces in the Egyptian city of Rafah, near the border with southern Gaza Strip...Smoke rises as a house is blown up during a military operation by Egyptian security forces in the Egyptian city of Rafah, near the border with southern Gaza Strip November 6, 2014. At Egypt's border with the Gaza Strip, families are emptying their homes - lugging mattresses and furniture onto waiting vans as soldiers look on from armoured cars. In nine villages along the frontier, 680 houses - homes to 1,165 families - are being razed to seal off smugglers' tunnels and try to crush a militant insurgency in northern Sinai that has intensified since the army overthrew President Mohamed Mursi of the Muslim Brotherhood 16 months ago.

Ibraheem Abu Mustafa/Reuters

Smoke rises as a house is blown up during a military operation by Egyptian security forces in the Egyptian city of Rafah, near the border with southern Gaza Strip on Thursday. In nine villages along the frontier, house are being razed to seal off smugglers’ tunnels and try to crush a militant insurgency in northern Sinai

Tourists on traditional boats sail in the Beihai military water tunnels on the island of Nangan in the Matsu archipelago...Tourists on traditional boats sail in the Beihai military water tunnels on the island of Nangan in the Matsu archipelago, off northern Taiwan, May 8, 2013. The Matsu archipelago, which was once front line against China, is now a military tourist spot.

Pichi Chuang/Reuters

Tourists on traditional boats sail in the Beihai military water tunnels on the island of Nangan in the Matsu archipelago, off northern Taiwan on Wednesday. The Matsu archipelago, which was once the front line against China, is now a military tourist spot.