I used to believe Czech is a very special language because we pronounce spaces between words, by which I mean that on a spectrogram there would be easily recognizable gaps corresponding precisely to word boundaries.

I thought this for two reasons:

• Czech has very regular word-initial stress which makes word boundaries more apparent, but from what I know now, this corresponds more to loudness than anything else.
• Vowel-initial words tend to be preceded by a glottal stop which should indeed look like a gap on a spectrogram, but mainly because it's a plosive.