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Photo: Nima Baghaei, Public domain via Wikimedia Commons
Citadel from the 12th century.
Furg Citadel, also known as Forg citadel and Mirza Rafi Khan citadel, is an 18th-century citadel located in Furg Village in Darmian County, South Khorasan province, Iran.
© OpenStreetMap contributors
باغ و موزه اکبریه
UNESCO heritage site. Rows of pine trees and sunken terraces and such.
ارگ کلاهفرنگی بیرجند
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.
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.