I can safely say it's way better than Paris, as for other cities, yeah it's strangely beautiful that I can't quite work it out. You'll need to head over there to see for yourself.
When my parents went there, they said the same I thought otherwise until I went there.
Astronomical clock - if you head there on Saturday or Sunday you might gate crash a Wedding as it's on a church.
Charles Bridge.
Old Prague and New Prague - basically 2 era of Prague divided by river, one modern and one old fashioned, you get the idea.
Prague Castle.
'Hunger' wall - short walk from Prague Castle.
Jewish cemetery - not quite why it's a must see attractions but I was told it's quite important bit of history in Prague by receptionist in my hotel.
Freedom steps, same area as 'Hunger' wall.
That's it off my head, pretty sure these all I've been to, and I'm sure there's more. There's a weird clock on the hillside alongside Prague Castle that I struggle to remember the name of it.
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