Unless you rent a car or book a pricey tour, there isn't really an easy way to get to Stonehenge. We recently splurged on a pair of folding bikes, so we elected for the choose-your-own-adventure option - we booked a train ticket to a small town called Salisbury and biked to Stonehenge from there.
When we arrived, we discovered that it's actually quite pricey to get into the visitor area surrounding Stonehenge (£18.20 ($30 CAD) per person). Even if you pay the entrance fee, the stones themselves are fenced off by a rope, so the closest point is still about 10m away.
Lucky for us, when we arrived at the entrance, a nice older gentleman approached us and asked if we had tickets. We said no, so he proceeded to tell us that we can head back to the the visitor's centre to pay £18.20 each and then come back to get into the designated visitor area, or we can continue walking just a few meters further, enter the gate along the farmer's fence, and see the stones from there.. for free. Seemed like a no-brainer for us, so we graciously thanked him! He gave us a friendly smile while pointing out the farmer's fence and forewarning us, "just watch out for the sheep droppings, they can be slippery!".
So, if you don't mind seeing Stonehenge from 20-30m away instead of 10-20m, you can do so for free!
Bringing our bikes allowed us to also explore the surrounding area, including Stonehenge Cursus and Woodhenge.
We ended up biking around 48 km, mainly along quiet country roads, so we saw some really beautiful countryside. We stopped to visit the towns of Amesbury and Salisbury along the way and finished off our first folding-bike adventure at a nice traditional pub where we tried fish & chips with mushy peas, a traditional meat pie, and cider.
We were surprised that about 30-40% of the bike commuters that we see daily in London, are riding Brompton folding bikes. The bikes are built in the UK and really well designed, but they are relatively quite expensive. We suppose they do make a lot of sense for people living in these huge megalopolises where property value is outrageously high - apparently you can actually find studio flats here, as small as 9 sq.m., for sale at a mere... £295,000 (approx. $530,000 CAD)!!
So far, we've found the Bromptons really fun to ride and they make it easy to zip around and explore.. plus they fold up so small that we can even keep them under our desks when we commute to work!