Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

The oldest inn in Kilkenny was established by the first convicted witch in Ireland.

Local legend says the remains of Father Christmas lie within the medieval grounds.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

Called the "Armenian Stonehenge," this ring of menhirs pierced with holes may be a prehistoric astronomical observatory.

Despite producing just a handful of movies, a brave and lyrical filmmaker has an entire museum dedicated to him.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

The ruins of a medieval monastery built on a perilous slope.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

A geological oddity topped with a 2,000-year-old pagan temple.

The shell of a medieval fortress offers commanding views of the area it once protected.

The world's oldest known salt mine.

The personal charnel house of Anton Bruckner.

This series of underground chambers contains Europe's largest subterranean lake that is slowly drained each day.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.