Deoghar

Day 1 - Reach Deoghar, preferably by noon and take some rest. In the evening, you can go to the main market for a stroll, where you can buy precious curios and souvenirs, especially the holy memorabilia of the Baidyanath Dham that you can take home for your families. 
 Day 2 - The 2nd day should be the ideal time for starting your trip through Baidyanath Dham, barely 2 km away from the town of Deoghar.
Day 3 - This day should ideally be reserved for a rest. However, if you wish to have an insight of the whole town, you can visit the Naulakha Mandir for the start. Thereon, you can proceed for a trekking spree to the Trikuta Parvat, or if you prefer to do some soul searching and religious study, go for Ramakrishna Mission Vidyapeeth.

Abode to the holy Baidyanath. Lovely in terms of architecture and serenity.

Not ideal without proper guides. Beware of fraudsters.

Ideal for both Sanatan Dharma devotees and Shaivites. Also suitable for backpackers touring nearby sites like Patna, Nalanda etc.

The best time for visiting the holy pilgrimage of Deoghar is in winters, especially during the months from October until March. The summers are unbearably hot while the monsoons might dampen your plans, although it's lovely and inviting if the rainfall is more than average.
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The food here is dominated by vegetarian dishes. One can also enjoy a number of Bihari snacks available in the area. Other than that you will find instances of the state cuisine such as Bamboo shoots, Rugra, Kanda, Mahua, Arsa Roti, Dubhni Roti and much more.
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The railway station nearest to Deoghar is Baidyanath Dham which is 7 km away from the main city. Jasidih junction is another 7 km from Deoghar and it lies on the Delhi-Howrah route. This station is connected to most of the other major cities in the country as well. Deoghar is also connected via road to all the major places. The nearest airport is at Patna (230 km) and one can take a cab or a bus from there to reach Deoghar.
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The top things to do in Deoghar are Baidyanath Dham, Nandan Pahar, Tapovan Caves and Hills, Naulakha Mandir, Basukinath, Satsang Ashram. You can see all the places to visit in Deoghar here

The top places near to Deoghar are Santiniketan which is 133 km from Deoghar, Kolkata which is located 271 km from Deoghar, Nalanda which is located 144 km from Deoghar, Rajgir which is located 142 km from Deoghar, Purulia which is located 132 km from Deoghar