Dark Skies events
Local astronomical societies run stargazing events throughout the year; visitors can use the mobile planetarium and telescopes.
breconbeacons.org/darkskies

Star Marathon
Crai reservoir is one of the best Beacons locations for stargazing; on the weekend of 6 December the village is hosting a 48-hour astronomy event.
facebook.com/CraiValley

Llanthony Priory
The remains of a beautiful monastery not far from Abergavenny is an atmospheric spot for observing the night sky. Some of the ruins were converted into a house – now the four-room Llanthony Priory Hotel (01873 890487, llanthonyprioryhotel.co.uk, doubles from £85 B&B), which also has a bar, possibly once the prior's quarters. Or try a nearby Llanthony Treats bunkhouse (01873 890867, llanthonytreats.co.uk, camping £3pp, bunkhouse £12).

Hay Bluff
The road over Gospel Pass from Llanthony reaches Hay Bluff, a hill overlooking the Wye valley with great views over Powys and Shropshire. After stargazing from the summit, carry on to lovely Hay-on-Wye.

Craig y Nos Castle
This neo-gothic castle is now a hotel surrounded by a country park, perfectly situated for looking at the stars (01639 730725, craigynoscastle.com, doubles from £67.50).