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The Golconda Fort was first built by Kakatiya in
945 CE – 970 CE.
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It was later strengthened by the Musunuri Nayaks.
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The Golconda fort used to have a vault where the
Kohinoor and Hope Diamond along with many other gems were stored.
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Golconda
consists of four distinct forts with a 10 km long outer wall 
with 87 semi-circular bastions (some still mounted
with cannons), eight gateways, and four drawbridges.
with 87 semi-circular bastions (some still mounted
with cannons), eight gateways, and four drawbridges.
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The lowest of these is the outermost enclosure
into which we enter by the gate, studded with giant iron spikes (to prevent
elephants from battering them down) near the south-eastern corner. 
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A
hand clap at a certain point below the dome at the entrance reverberates and
can be heard clearly at the 'Bala Hisar' pavilion, the highest point almost a
kilometre away. This worked as a warning note to the royals in case of an
attack.
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The whole of the Golconda Fort complex and its
surrounding spreads
across 11 km of total area, and discovering its every nook is an arduous
task.
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A visit to
the fort reveals the architectural beauty in many of the pavilions, gates,
entrances and domes. 
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The lush green gardens may have lost the fragrance
for which they were known for 400 years ago, but it is still recommended to
walk through them if you ever visit the fort. 
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The
palaces, factories, water supply system and the famous "Rahban"
cannon, 
within the fort are some of the major attractions.
within the fort are some of the major attractions.
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The
fort also contains the tombs of the Qutub Shahi kings. These tombs have Islamic
architecture and are located about 1 km north of the outer wall of
Golconda. They are encircled by beautiful gardens and numerous exquisitely
carved stones.
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It
is believed that there is a secret underground tunnel that leads from the
"Durbar Hall" and ends in one of the palaces at the foot of the hill.
It is also believed that there was a secret tunnel to Charminar.