Rome is the obelisk capital of the world. The most prominent is the 25.5 m/83.6 ft high 331 ton obelisk at Saint Peter's Square in Rome.
The elder Pliny in his Natural History refers to the obelisk's transportation from Egypt to Rome by order of the Emperor Gaius (Caligula).  Sixtus V was determined to erect it in front of St Peter's.  Before being re-erected the obelisk was exorcised.