The Sweden Solar System (world’s largest model of our planetary system)

A smaller model (1 billion to one scale), the "Planetenweg," is on the bicycle path between Georgensgmünd and Spalt, about 30 minutes south of Nuremberg: https://www.georgensgmuend.de/de/freizeit-kultur-tourismus/s...

Since it's only 7.5km (about 5 miles) from the Sun to Pluto, it's a feasible daytrip with kids.

These two videos of other solar system models are great:

There's on in Zagreb, Croatia.