Hatfield House is a country house set in the Great Park, on the eastern side of the town of Hatfield. The present Jacobean house was built in 1611 by Robert Cecil, First Earl of Salisbury and Chief Minister to King James I and has been the home of the Cecil family ever since. It is currently the home of Robert Gascoyne-Cecil, 7th Marquess of Salisbury. The house is open to the public. An earlier building on the site was the Royal Palace of Hatfield. Only part of this still exists, a short distance from the present house. This palace was the childhood home and favourite residence of Queen Elizabeth I.

Royston Cave is a small but absorbingly interesting artificial cave in Royston. It may have been used by the Knights Templar, who are also thought to have founded nearby Baldock. It is open to the public in the summer months. Royston Cave is a circular, bell-shaped chamber 8 metres high and 5 metres in diameter with a circumferential octagonal podium. The origin of this chamber is unknown This cave is unique in Britain - if not the world - for its numerous medieval carvings on the walls.They are mostly of pagan origin, but some of the figures are thought to be those of St. Catherine, St. Lawrence and St. Christopher.

The grounds of Knebworth House have become a major venue for open air rock and pop concerts since 1974 when The Allman Brothers Band attracted 60,000 at the first large concert held at the venue. Since then, it has been the scene of outdoor extravaganzas featuring Pink Floyd (1975, 1990), Oasis (1996), Lynyrd Skynyrd (1976) The Rolling Stones (1976), Genesis (1978, 1992), Frank Zappa (1978), Led Zeppelin (1979, their final two UK shows, playing to record crowds in excess of 200,000 people), Mike Oldfield (1980), The Beach Boys (1980), Cliff Richard (1983, 1990), Deep Purple (1985) and Queen (1986- their final show with Freddie Mercury).

First discovered in 1847, the Roman Theatre of Verulamium in St Albans was not fully excavated until the 1930s, during which time a row of shop foundations, a Roman Villa and a secret shrine were unearthed. Built in around 140AD and having a stage rather than an Amphitheatre, it is the only example of its kind in Britain and one of the country's most important archaeological sites. Originally used for religious rites, ceremonies and entertainments such as bear-baiting and cock-fighting, this impressive theatre would have seated some 2,000 people.