Tatev Monastery

A ninth-century Armenian monastery complex perched on a basalt plateau above the Vorotan River gorge in southern Armenia's Syunik province. The monastery is reached via the Wings of Tatev, a reversible aerial tramway covering 5.7 kilometers — the world's longest non-stop double track cable car — which offers elevated views over the gorge and the surrounding mountain ranges. The monastery itself contains a series of churches, a library, and a famous oscillating column called the Gavazan that was designed as a seismic early-warning device.