Tighter controls are planned for an expected 23,000 visitors to Stonehenge for the summer solstice.
English Heritage says it has a duty to protect the site
New restrictions this year will mean visitors will not be able to get onto the site until 0200 BST and will be banned from bringing sleeping bags.
The stones will be open from 0200 BST to 12 noon on Saturday 21 June, and access will be free.
Visitors face random searches before entering the site.
Dr Simon Thurley, chief executive of English Heritage, said: "We are very pleased to welcome people to Stonehenge to celebrate the summer solstice.
Conditions of entry
No climbing on the stones
No large bags, rucksacks or sleeping bags
No fires, flaming torches, candles or fireworks
No amplified music: acoustic only
No dogs or pets
No tents or garden furniture
No glass or cans
"We have set conditions of entry which are in accordance with our duty of care to the public and to Stonehenge."
Kevin Carlyon, a self-confessed white witch, told the BBC: "I can see where they are coming from.
"Plastic only is a good idea, for example, as people do try and scratch their initials into the stone with pens and so on."
English Heritage says drunken, disorderly or antisocial behaviour will not be tolerated and that only small amounts of alcohol for personal use will be permitted.
English Heritage reserves the right to refuse admission.