Kolkata was once the capital city of British India and also the Gateway to India till 1912. It is a major commercial city consisting of big industrial plants and corporate houses . Visiting the Flower Market, Dakhineshwar Temple, Kumartuli (potters village) south of the temple & one of Mother Theresa’s many homes for the underprivileged.
Victoria Kalighat temple, the main Kali temple (Durga) in Calcutta.Kalighat

A drive along the Tista Valley takes you to the Sikkim border at Melli and then you travel through the Rangit Valley up to Pemyangtse. From here one can view Mt. Khangchen Dzonga (8,588 m / 25,169 ft), Pandim (6,693 mt/21,953 ft), Visit the premier monastery of Pemyangtse (Perfect Sublime Lotus). A 2 km walk from the main road near Pemyangtse Monastery through a thick forest will take you to Rabdanste Palace.

Drive to Gangtok enroute visiting Rumtek Monastery, which is perched on a hilltop facing the city of Gangtok. After your visit a short drive takes you to Gangtok, the “Lofty Hill,” which is the capital of Sikkim. In Gangtok visit Enchey Monastery. Other places of interest during your day in Gangtok are: Government Institute of Cottage Industries: This center offers the opportunity to observe local artisans at work.