This medieval Italian town is a sheer (and beautiful) cliffside defense.

These disused steel furnaces are now haunting ruins that may one day be a national park.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

A rare festival blending religion, blacksmiths, vagina dentata, sex workers, and the straight-up facts of life.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

Colorful and chaotic stacked hotel in North Holland.

Europe's largest natural bridge has a 19th century royal chateau built into its side.

This lovely university observatory continues to sit abandoned since its potential savior was sent to jail for fraud.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This Pringle-shaped ledge makes for the perfect photo op.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

This haunting stone chasm is a hotbed of mossy rock and English legend.

Home to three historic ships from the age of Vikings.

This observatory within Europe's first dark sky park offers stunning views of the night sky.

The steepest classic funicular in the world glides along a dizzying incline.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

The ruined remains of a coal mining ghost town are hidden within the woods.

A Nesting Doll of Churches.

An icy lake tucked among jaw-dropping alpine panoramas.

This crumbling folly looks like an enchanted left over from Middle Earth.