Erupting geysers, rainbow hot springs and herds of bison by the road. Here's what Yellowstone is like with the family, when to go and how long to stay.
National parks charge an entry fee per vehicle, or buy an annual pass. Check entry rules on GOV.UK before you book.
June to September is when all roads and lodges are open, with July and August busiest. Late May has baby bison, and September is quieter with wildlife on the move. From November to April most roads close to cars.
The famous geyser erupts roughly every 90 minutes. Times are posted at the visitor centre.
A huge hot spring in rings of orange, yellow and blue. See it from the overlook trail.
Bison, elk and maybe wolves or bears. Bring binoculars at dawn or dusk.
A yellow canyon with a thundering waterfall.
Children complete activities to earn a badge from a ranger.
Jagged mountains and lakes just to the south.
Yes, it's like a giant outdoor science lesson. Stay on boardwalks, as the hot springs can kill, and keep well back from bison.
Four to six nights in or near the park, as part of a wider road trip.
Most British passport holders, children included, apply for an ESTA online before they fly rather than a visa. Check GOV.UK for the current rules.
Park lodges book up a year ahead. Towns near the gates, like West Yellowstone and Gardiner, have more choice.
Put Yellowstone on standby with everyone's other ideas. You each spread your points in secret, get one veto, and the draw picks where you go.