KLAGENFURT, Austria — An Austrian stunt cyclist took his bike to the top of a 650-foot-tall dam to ride across the ultra-narrow top of a safety railing.

The vertigo-inducing video posted to YouTube by Fabio Wibmer shows the cyclist’s helmet-mounted camera footage as he rides the railing, which is barely wider than his bicycle tire, atop the 650-foot-tall Kolnbrein Dam in Austria.

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