The secret medieval communication system will whisk your words above the noise of the crowd.

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

An imperial fortress city that incorporated cultural elements from the entire Mughal empire, only to be abandoned the year it was finished.

This opulent 16th-century Maharaja’s palace is a unique mix of Hindu and Muslim designs.

An ancient wall in the shadows of the Amber Castle.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The world's second-largest sundial, made entirely out of stone.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

The roof of one of the world’s largest spice markets provides a grand view over the neighborhood's glorious bustle.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Secret refuge and museum of the Duke of Florence.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

A medieval weapon rumored to have been used by the brilliant poet himself.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

Florence’s archaeological museum displays an ordinary stool that once shattered one of its most prized artifacts.

A plaque on the base of this statue holds a bewitching design.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The oldest operating pharmacy in the world features 800-year-old recipes.

More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

A diverse collection of wax, bone, papier-maché and mummified relics.

This building features dozens of faces along its facade, although one is a bit chilling.