A line of abandoned, alien-like fortresses dot the mountains of North Italy.

A beautiful discovery site of prehistoric burials.

This 18th-century dissection theater's frescoes display a gorgeous tension between the terrestrial and esoteric.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.

Beautiful views and Roman-style statues on the Italian coast.

Windblown rock formations in an ancient Roman quarry.

The highest waterfall in Italy is only "turned on" five times a year.

On the coast of Sardinia, a once-great mining village is finding new life as a coastal resort town.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

These delicate sand pyramids look like naturally occurring gothic spires.

Southern Italy's spinning top village.

"The prettiest love letters in the world" ... or so said Lord Byron.

A sulfuric hellscape in southern Italy.

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

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Walk through a fairytale in Tuscany.

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

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

The location of the last witch trials of Italy, known as "The Salem of Europe."

An ancient artistic garden parlor full of hidden water wonders.