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A palace built during the Qajar dynasty (i.e. 1789-1925) with some ziggurat features. Now the government buildings for South Khorasan so not much in the way of snooping around possible.
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قلعه بیرجند
It has got a pretty wowee look to it - big ramparts and turrets made of clay and brick. And then you can look down on the town from the top, and have a meal at the restaurant there. It dates from the Safavid era when the inhabitants were trying to fight off theTurks and Uzbekis.
باغ و موزه اکبریه
UNESCO heritage site. Rows of pine trees and sunken terraces and such.
Arg e Furg
Citadel from the 12th century.