If you visit Stonehenge, you might like some of the other monuments in the area which are a little less busy, and just as impressive.
The area around Stonehenge is often known as Wessex.
Thomas Hardy famously loved this area and based many of his books here.
Other ancient mystical monuments include the
Uffington White Horse, the Cerne Giant, Avebury Circle, and Glastonbury Tor. There are spectacular natural sights such as Wookey Hole and Durdle Door, plenty of natural parks and the 'Jurassic Coast' (a UNESCO World Heritage Site). Along the south coast are ports and fishing towns like Weymouth, Abbotsbury and Poole.
Walking, cycling and windsurfing are popular activities, and you must visit a traditional pub for a Ploughman's Lunch and local Ales and Ciders.

Uffington White Horse - There are a number of horses (and other symbols) carved onto chalk hillsides in this area, but the Uffington Horse is the only one that is almost certainly prehistoric.

The Cerne Giant, Cerne Abbas - Like the Uffington Horse, this figure is carved into a chalk hillside. Noone knows who carved it or when (some people think it is prehistoric fertility symbol, others think it is much later). There is a local legend that if a woman sleeps on the giant overnight, she is sure to have a child. However, the giant is now fenced off to preserve him and his powers

Avebury Stone Circle - this is a larger stone circle than Stonehenge, and encircles the village of Avebury. The village is a centre for crop circles and paranormal activity, but is also very pretty.

Glastonbury Tor - The tor overlooks the town of Glastonbury, which is an established centre for alternative culture and both Christian and Pagan pilgrimages. The famous Glastonbury music festival takes place near here. The Tor itself is a hill overlooking the Somerset levels, with the 15th Century St Michael's Tower on top. Local legends say that there may once have been a stone circle on the Tor, and/or King Arthur may have had a fort here. There have also been sightings of fairies, elves and aliens here
http://www.glastonburytor.org.uk/mysterytor.html
Durdle Door, Dorset Coast - This is not so mystical, but is a good example of a limestone arch. The 'Jurassic Coast' is so called because of all the fossils found in the limestone cliffs, so it is interesting if you like geography and archaeology.