Tiruchirappalli’s Rockfort is a historic fortification and temple complex built on an ancient rock. The fort is constructed on an 83 metres (272 ft) high rock.
- The rock is one of the oldest formations in the world.
- The rock is 3.8 billion years old (380 crore years old), making it as old as the rocks in Greenland and older than the Himalayas.
- There are two Hindu temples inside, the Ucchi Pillayar Temple and the Thayumanaswami Temple.
- The oldest structure in the fort is a cave temple built by the Pallavas in 580.
- Madurai Nayaks constructed the Rock Fort Temple Lake.
- The Pallavas initially built the Ucchi Pillayar temple, but the Nayaks made use of its naturally fortified position and designed it again.