This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Italian cave with exceptional acoustics and an unsavory history.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

The world's most active stratovolcano is almost always erupting.

This half-finished "city of toys" was almost Italy's own Las Vegas.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

This winding road through an Italian canyon may be the most scenic drive in the world.

Walk through a fairytale in Tuscany.

One of the largest caves in the world open to the public.

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

Romans built the world's tallest artificial waterfall in 271 BC.

This abandoned Brutalist treehouse is a hidden architectural relic.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

A sunken idol welcomes parishioners to Davy Jones' Locker.

A Milanese café entirely designed by the American director Wes Anderson.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.