Visit the Jantar Mantar observatory

Watch the sun rise along the Thirteen Towers of Chankillo, a 2,300-year-old solar calendar in the desert

Boulder-strewn ruins of the Vijayanagara empire along the Tungabhadra river.

India's first UNESCO city: Gandhi's Sabarmati ashram, stepwells, pols and the textile museum.

Visit Jaipur, the capital of Rajasthan known as the Pink City. Explore the Amber Fort (a hilltop fortress with intricate carvings and elephant rides), see the Hawa Mahal (palace of winds with 953 small windows), visit the City Palace (royal residence with museums and courtyards), and shop for handicrafts at Johari Bazaar (famous for jewelry and textiles).

Space theme park in Europe’s aerospace capital: a full-size Ariane 5, a Mir station mock-up and a planetarium.

The world's oldest and largest spaceport.

Bill Bryson explains the universe, the atom and the dinosaurs as if to a friend in a pub.

John Harrison's clocks solve the problem that sank ships; Dava Sobel's short classic.