Other sights in HertfordshireHertfordshire, England

Granite column of 1832 rising above the Ashridge beeches near Aldbury, climbable in summer for a thirty-mile view across the Chilterns.

Rows of lavender and sunflowers you can walk and cut on a chalk hillside at Ickleford, above Hitchin, at their best in high summer.

Deep wooded Iron Age earthwork on the edge of Wheathampstead, thought to be part of a stronghold of the Catuvellauni tribe.

The 2012 Olympic white-water course near Waltham Cross, open for rafting and kayaking over the rapids.

Walter Rothschild's own zoological museum in Tring, its Victorian galleries crammed with mounted animals from around the world.

Family wildlife park near Broxbourne with big cats and hundreds of exotic animals, voted a top county attraction.

The largest shell grotto in the country, six flint-and-shell chambers dug into a Ware hillside by the poet John Scott in the 1760s.

The Making of Harry Potter at Leavesden, a walk through the original film sets, props and Diagon Alley near Watford.