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Built in 1280, this castle has a fascinating life story. It is the second largest castle and grounds in UK, slightly smaller than Windsor castle. The water defenses are now home to plenty of birds and the grounds offer fantastic views of this stunning castle

Might be closed down now according to google maps.

Mostly tarmac

Whatever you do is don't cycle around the reservoir, got told off and abusively shouted at.

Caerphilly Castle has had a £5m investment into conservation and repair of the structure - from late October '22 the scaffold and sheeting that protected the works will be removed. Caerphilly Castle is the biggest castle in Wales, and second biggest in the UK. Wales’s very own Leaning Tower, even wonkier than that of Pisa — courtesy of Civil War gunpowder is probably the castle’s best-loved feature.

Not sure about opening hours because it’s pretty new but the owner said she’s going to be there as much as possible (every day at the moment)

This paved shared-use trail alongside the River River Rhymney is a really delightful way to avoid the busy Newport Road on the other side of the industrial estate, and you get to soak up some nature too. The trail features on National Cycle Route 4 and the Celtic Trail, but be sure to take care here as it is also popular with walkers and runners from nearby Bedwas and Trethomas.

Nice place to park with benches for having a picnic before or after starting the walk!