Stonehenge is an awesome place, and a lot more complex than I had realized before visiting it. Construction on it began around 3000 BC, and happened in several phases over the course of 1400 years. First came the bank and ditch around the outside, then an inner circle of undressed bluestones. Then there's a horseshoe of massive trilithons (pairs of standing stones with a single lintel). Most impressively, the outer sarsen circle is a marvel of precision engineering - the lintels were shaped to create a perfect circle, despite the fact that the earliest known calculations for pi are from Archimedes around 250 BC. The lintels are also held in place by two types of joints - they connect end to end with tongue and groove joints, and on top of the standing sarsens with mortise and tenon joints.

Naturally, we took a lot of pictures here, including some extremely cool ones at sunset:
one of our first glimpses of Stonehenge, from outside the sarsen circle
me, sitting on the bank that encircles Stonehenge
the Heel Stone
a view from outside the sarsen circle
another view from outside the sarsen circle
a Wiccan member of our tour group dowsing
JP trying his hand at dowsing
another view from outside the sarsen circle
yet another view from outside the sarsen circle
me, crossing the rope
the three remaining complete trilithons
me, inside a part of the sarsen circle
a view from the center of Stonehenge
another view from the center
some Victorian-era graffiti carved into one of the stones
closeup view of a trilithon
view of a trilithon from the ground at its base
some of the remaining sarsen circle
a portion of the sarsen circle with no lintels (tenon visible on one)
what might be a face carved into one of the stones
the precise fitting of the lintels in the sarsen circle
a fallen lintel (mortise visible)
imprint of a dagger and axe ("Mycenaen dagger")
sunset through the stones
another view of sunset through the stones
high-resolution pic of sunset through the stones