What kid tv shows were playing in the late 90's-2000s?

i was born in 96 and i have been wanting to remember what tv shows i
used to watch on pbs kids, wttw kids, nick. also, there was this show
which opened up as a bunch of kids coming together with cardboard
boxes and setting them all up in a back yard then went inside it and i
was a big room. could somebody tell me what the name of that was?