Avebury plus lots of other semi-abandoned "stone circles" that you can headbut to your hearth's content.
well if it is a dream, and money is no object offer $1 million "donation" to the english heritage thrust, i am sure they will allow you to stroke the dolmens.
Else you can always hire mercenary comandos, neutralise the guards and get intimate with the megaliths...
a simpler "solution" though would be to do a dodge and run during your inner tour and quickly caress a stone before spending the next few hours being questioned by the police and paying a fine....
a word of caution, as Stonehenge is highly mediatised, surounded by wild theories, and shrouded by fantasy, and since it has been a lifelong dream for you...you might be quite underwelmed by the reality of it...
For me, while being quite unimpressed by the henge itself, i found that the crows perched on the stones brought a sacred timeless dimension to the place.