Vitim River Bridge, Russia

Crossing the Vitim Rivier in Siberia is the aptly named Vitim River Bridge, a disused railroad crossing built in the early 1980s that is now used by automobiles and motorcycles. With a drivable surface made of railroad ties and reportedly not much more than six feet wide, it is a sketchy drive, to say the least.

Fully frozen for most of the year and without any side-rails, Vitim River Bridge has only been crossed successfully by a handful of people in Russia's history. Though scary, a lot of adrenaline junkies come from across the globe to challenge themselves by trying to cross the bridge.

Vitim River Bridge was originally built in 1982 for trains traveling on the Baikal-Amur Mainline. It was abandoned due to poor construction techniques that left it unable to cope with the river's current in the spring, and chunks of ice in the winter. Another railway bridge was built roughly a quarter-mile up-river to replace it, and the original bridge's life as a light-vehicle crossing began.

The structure, also known as the Kuandinsky Bridge, was never designed for this, of course. The wood surface is constantly rotting away due to the Siberian weather and it is slick in the winter thanks to snow and ice. It is still used with relative frequency though, with some crossing it as part of a long adventure, and others crossing regularly out of necessity.