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

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

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Where Venice's gondolas go for a tune-up.

Two stone columns flank the grand Venice square, but there were supposed to be three.

An extensive collection of reliquaries containing the bones of saints housed in the largest Catholic church in Venice.

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

100 year tradition of fist fights, marked by marble footsteps.

Go inside to really appreciate this 500-year-old technological masterpiece.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

Croatia's "hairy stone" fortress is one of the most well preserved Istrian castles.

The Renaissance-era courthouse is a relic from the fortified town's centuries of Venetian rule.

An ethereal glowing blue ocean cave in Croatia.

These phallic stone spires once served as Tolkien's Paths of the Dead.

Largest Kauri tree in New Zealand.

This faded sign to nowhere is a beloved icon in New Zealand.

Water-powered gadgets whirr to life in this quirky eco park.

Known for the tunnel that leads visitors to the water.

One of the world's steepest streets seems to have houses sliding down it.

A lakeside garden in the Southern Alps full of whimsical artwork and thousands of beautiful flowers.

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.