The site is immediately off the main A29 road, straight after a long tunnel if travelling from Palermo.
Tarantola Bus goes between Palermo and Calatafimi (aka Calatafimi-Segesta) a few times daily [dead link], stopping at Segesta en route. You may have a long wait for a return bus. (Perhaps confusingly, Segesta Bus does not go to Segesta.)
Onsite there is free parking.
Entry to the temple is on foot - about a 5 minute uphill walk.
A bus (EUR 1.50) is available every 30 minutes to the site of the Amphitheatre at the top of the hill. It's a brisk, uphill 20 minute walk alternatively (no entrance fee).
There are 3 major sights at this location:
- the Doric temple - built 430-420 BCE, 61 m (190 feet) long, 26 m wide, built upon a platform of 4 steps, with a total of 36 Doric columns supporting the stone roof-frame of the structure (14 columns along the lengths of the building, 6 columns across front and back). The columns are of a "rough" finish because they were apparently never "fluted", the temple never reaching completion. The temple seems also to have lacked a roof over the cella (main chamber) in antiquity, rather uniquely - scholars are in disagreement as to whether the temple was deliberately planned this way, or just never completed. Entry is charged.
- the Amphitheatre - an amazing hilltop feature built by the Greeks c 400BC, known by the Romans and rediscovered in the 19th Century. Hosts dramatic theatre in the Summer months.
- the Greek sanctuary - Inside the archaeological area (in contrada Mango) there are the ruins of an ancient sanctuary, probably dating back to the 6th century B.C. and built outside the town centre of Segesta.
In addition, there are other remains from the Roman and medieval periods which are documented by signs in five languages across the site.
Coffee and pizza are well deserved at the cafe near the car park if you walked to the amphitheatre.