After visiting St. Stephen's church a walk leads to the Budapest's Champs-Elysees, Andrasy avenue.
Spacious, big, beautiful street, where you can see many famous buildings of Budapest including the Opera House, but also infamous House of Terror of which I do not want to think, just to mention it and that is enough.
On the very end of the avenue there's magnificent Heroes' Square.
And at the end I have to mantion one interesting fact or novelty, all those who were in Budapest before July 2014, didn't experience driving on the wheel of Budapest or as I call it Budapest eye. It's not as monumental as London eye but it's nice an interesting and you should try.
I almost forgot to mantion Vaci street one of the main pedestian and the most famous street of Budapest. It contains many restaurants and shops, it is Budapest's shopping zone.