Golden Oak Treehouse at Forest of Dean

Puzzlewood is an ancient woodland site near Coleford in the Forest of Dean, covering 14 acres. Over a mile of pathways, laid down in the early 19th century, wind through strange rock formations, secret caves and ancient trees. The paths make a confusing maze, so expect to take a few wrong turns.

Goodrich Castle is a ruined medieval fortress on a rocky sandstone outcrop above the River Wye, near Ross-on-Wye. Begun after the Norman Conquest, it grew into a stone castle with a square keep, big corner towers and a gatehouse with a barbican. William Wordsworth called it the "noblest ruin in Herefordshire".

Tip: Book advance tickets online through English Heritage, and pick up the family game from the ticket office when you arrive.

Clearwell Caves is a natural cave system on the edge of the Royal Forest of Dean, mined for iron ore and ochre for thousands of years. Ten well-lit chambers are open to visitors, with displays throughout and a small museum. You can still meet Freeminers here, and the caves still produce ochre for artists' paints.

Tip: Book online and check the booking calendar first, as the caves only open on the dates shown. Parking is free.

Chepstow Castle stretches along a limestone cliff above the River Wye. Building began in 1067 under William fitz Osbern, a close friend of William the Conqueror, and it is the oldest surviving post-Roman stone fortification in Britain. Over the centuries it passed to powerful figures such as William Marshal and Roger Bigod, each of whom left their mark.

Tip: Book online to save 5%. The main path is a steep slope and the steps can be uneven or slippery when wet, so wear sturdy shoes.

Raglan Castle sits just north of the village of Raglan in Monmouthshire, south east Wales. Built and rebuilt between the 15th and early 17th centuries by the Herbert and Somerset families, it was once a luxurious, fortified home, and its large hexagonal keep is known as the Great Tower or the Yellow Tower of Gwent.

Gloucester Cathedral is one of Britain's greatest buildings, with a history stretching back to around 679. Inside you can see the giant pillars of the Norman Nave, intricate fan vaulting (a style invented here in the 1300s) and the grand tomb of Edward II.

Tip: Well-behaved dogs are welcome Monday to Saturday, but only assistance dogs are allowed on Sundays, in the Lady Chapel and on guided tours.

Bristol Zoo Project is a wildlife conservation park in South Gloucestershire, run by Bristol Zoological Society. It covers a large site, and its areas are designed to link ecosystems and conservation programmes around the world. Current areas include Bear Wood, Benoué National Park and Discover Madagascar.

SS Great Britain is a museum ship on Bristol's harbourside, designed by Isambard Kingdom Brunel. When launched in 1843 she was the largest passenger ship in the world, and one of the first iron, propeller-driven ocean liners.

Tip: Parking is available at the Maritime Heritage Centre car park next to the site, and you pay at the ticket desks. The Long Ashton Park & Ride is an alternative Monday to Saturday.}