Easily the most distinctive landmark in the city, St Vitus's soars above the walls of Prague Castle around it...
Built in 1344 by Charles IV on the site of the original Rotunda of St Vitus, erected by St Wenceslas in 925, the cathedral was finally completed in the early 20th century.
It is a huge Neo-Gothic masterpiece spanning a thousand years of history and absolutely crammed with religious artifacts, works of art and items of historical significance.
Probably the main sight within the cathedral is the sumptuously decorated Chapel of St Wenceslas, containing his bejewelled tomb.
Other major sights include:
The remarkable chancel built by Peter Parler (he of Charles Bridge fame).
A carved wooden panel showing the city of Prague in intricate detail, called 'Flight of Frederick of the Palatine' - my favourite because I love staring at maps for hours on end.
Tomb of St John Nepomuk (pictured below), made from solid silver and honouring the man who ended up murdered and thrown into the Vltava River for his troubles!
The Crypt where Charles IV and his wives are buried.
Also there are many brilliant stained glass windows including one by Alfons Mucha, the King of Art Nouveau - somewhat unaccountably I missed this because I didn't realise it was there...!
No matter - I shall see it next time I'm in Prague! ;-)