Lying at Italy’s geographic and historic heart, Lazio (or Latium) was the seat of the Roman Empire, and as such is teeming with ancient attractions, especially in the Eternal City of Rome itself. To the east, Tivoli has Emperor Hadrian’s exquisite and massive Villa Adriana. Civitavecchia, today a major cruise and ferry port, has been Rome’s main harbor since the second century. Many pre-Roman sites dot Lazio too, like the Etruscan necropolis at Cerveteri, dating from the 9th century BC.

It’s nicknamed the Eternal City for a reason. In Rome, you can drink from a street fountain fed by an ancient aqueduct. Or see the same profile on a statue in the Capitoline Museum and the guy making your cappuccino. (Which, of course, you know never to order after 11 am.) Rome is also a city of contrasts—what other place on earth could be home to both the Vatican and La Dolce Vita?

Iceland’s biggest city, Reykjavik bears the distinction of being the world’s northernmost capital, and for virtually every Icelandic visitor it serves as a gateway, just to the city itself or to the rugged adventure options beyond. Founded in the country’s southwest at the end of the 18th century, Reykjavik has been Iceland’s cultural hub ever since. These days, that culture includes a hip and internationally recognised music and arts scene, not to mention a notoriously wild nightlife.

Located near the National Capital Region of Delhi, this upcoming district houses numerous multinational companies and as a result, has plenty of tourist-friendly malls, hotels and restaurants. The area's top attraction is the Sheetla Mata temple, a popular pilgrimage site named for the Indian goddess who could dispel small pox; a festival is held there in March and July. For a more rural setting, visit nearby Sohna, which is surrounded by ancient ruins and known for its hot springs.

Laid out by British architect Edwin Lutyens, the Indian capital is a striking modern metropolis. A gracious contrast to Old Delhi's winding streets, the grand avenues and stately buildings of New Delhi are rich with history and culture, from Gandhi's Delhi home (and the site of his assassination) to the tomb of Humayun, a complex of Mughal buildings reminiscent of the Taj Mahal. Chaotic traffic is best left to the locals. Negotiate a good price for taxis or travel on the new Delhi Metro.

The buildings and monuments in Tirunelveli are astonishing. The famous Nellaiappar Temple in particular is a kaleidoscopic feast, an explosion of colour and detail that’s supported by musical pillars. Needless to say, it should be on your itinerary. Tour a nearby tea plantation, enjoy the cooling cascade of one of the area’s many waterfalls, or nibble on halwa (a local sweet) while you take in a Tamil film at the Central Theatre.