The best place in the world to buy tinned fish.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

The world's first underwater farm is home to more than 700 plants.

A rambling museum which honors the beauty in everyday objects.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

The mark of the Devil's horns on a marble column in Milan.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

Artist Diego Morlin's war between the natural and human worlds is a wanderer's delight.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Southern Italy's spinning top village.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

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

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Natural cathedral designed by Italian artist Giuliano Mauri.

An Italian hillside ghost town.

Geothermal waterfalls in Tuscany.

This abandoned Brutalist treehouse is a hidden architectural relic.