Bridge vines in Iya Valley, Japan

One of the three valleys of "hidden", in Japan, West Iya is the place foggy canyon, the river clean, and the roofs of straw or leaves, such as describing the Japanese centuries ago. To cross the river that flows along the Iya valley slopes, the robbers, the kstria, and refugees make a special bridge made of vines.

Below is a picture of a bridge of vines in 1880 :

First, the two plants Wisteria - one of the most robust vines - planted to extremely long from both sides of river. When the plant reaches a sufficient length, then woven together with the board to make a living botanical engineering, soft but very sturdy.
Bridges that have no sides, and a source of Japanese history shows that the bridge is unstable plants, and who tried to cross it the first time are often frozen in place, unable to proceed further.
Three of the bridges that still exist in the valley Yes. Although some (not all) of the bridges were reinforced with wire and strip the sides, it is still scary to cross. More than 42 meters in length, with a board that is placed every 6 to 8 inches, and the fact that one fell into the water from 4.5 story, make it unsuitable for people with acrophobia (fear of heights).
Some people believe the bridges that still exist vines was first built in the 12th century, which makes some of the examples in the world's oldest living architecture.

First, the two plants Wisteria - one of the most robust vines - planted to extremely long from both sides of river. When the plant reaches a sufficient length, then woven together with the board to make a living botanical engineering, soft but very sturdy.
Bridges that have no sides, and a source of Japanese history shows that the bridge is unstable plants, and who tried to cross it the first time are often frozen in place, unable to proceed further.
Three of the bridges that still exist in the valley Yes. Although some (not all) of the bridges were reinforced with wire and strip the sides, it is still scary to cross. More than 42 meters in length, with a board that is placed every 6 to 8 inches, and the fact that one fell into the water from 4.5 story, make it unsuitable for people with acrophobia (fear of heights).
Some people believe the bridges that still exist vines was first built in the 12th century, which makes some of the examples in the world's oldest living architecture.