Children's Fantasy

Question

^{An entry in Fortnightly Topic Challenge #35: Restricted Title 1.}

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A room full of me would be a child's fantasy.

Mini or large is what I can be,

I am a pirate, a superhero, and a civilian, all at once.

Make me fly or make me ride,

Allow your imagination to take play.

Foreign I may be,

But you may find my land in your own land.

You can even find me at a presidential center for show!

So, take me into your own hands to witness what I am.

Answer 1

I think this may be a bit broad as I can think of a few but here's the one that struck me first:

LEGO

A room full of me would be a child's fantasy.

Me as a child anyway

Mini or large is what I can be,

you can build big and small stuff, or maybe a reference to Micro-blox and Duplo

I am a pirate, a superhero, and a civilian, all at once.

Lego men can be pirates and superheroes or a mix and match

Make me fly or make me ride,

Airships and buggies

Allow your imagination to take play.

Has anyone seen the LEGO movie?

Foreign I may be,

I think it's like, Norwegian or something?

But you may find my land in your own land.

There's a lego-land here in the UK

You can even find me at a presidential center on a show!

Uncertain, but lots of places have lego miniature versions of themselves on display.

So, take me into your own hands to witness what I am.

A toy you make stuff from