Must visit a smallest country of the world

 Vatican city

The smallest country in the world is Vatican City, with a landmass of just 0.49 square kilometers (0.19 square miles). Vatican City is an independent state surrounded by Rome. Vatican City is not the only small country located inside Italy.

The centerpiece of the Vatican and one of the best places to visit, the magnificent St. Peter's Basilica was built between the 16th and 18th centuries, replacing earlier structure's that began in 326 on what is thought to be where St. Peter was buried. Ironically, it was the selling of indulgences to finance this building in the 16th century that provoked Martin Luther to begin the Protestant Reformation. The work of famous artists begins before you enter the church: in the portico are an equestrian statue of Constantine by Bernini and fragments of a mosaic by Giotto above the main doorway. It's from the old church, as are the double bronze doors. The huge nave - 185 meters long and 46 meters tall - rises to a dome 119 meters above and can accommodate a congregation of more than 60,000. 

Vatican City - St Peter's Church Map (Historical)

Built by Pope Sixtus IV in 1473-84, the Sistine Chapel is a rectangular hall, which is the Pope's domestic chapel, also used for services and special occasions. After the death of a Pope, the conclave to elect his successor is held here. 

Museum

The Etruscan Museum, founded by Pope Gregory XVI in the mid-19th century, has 18 rooms of artifacts, which shed new light on the life of the Etruscans and their idea of the afterlife. Among the findings from the Etruscan graves that have been excavated throughout Tuscany are not just funerary items, but art works and objects from the everyday life of these enigmatic peoples.