Thousands have gathered at Stonehenge for the summer solstice. Archaeologists believe people were doing the same thing on a nearby hillside 5000 years ago.

The ruins, located just five kilometers from Stonehenge, likely laid the groundwork for religious rites celebrating the longest and shortest days of the year

Dave Hamilton, author of a new guidebook to the weird and curious, shares some of the less-known places to celebrate the longest day of the year