Andrássy út is the avenue Budapest built to be looked at — two and a half kilometres dead straight from the centre to Heroes' Square, lined with opera house, mansions and embassies, and protected end to end as a UNESCO site. Walk it outbound, downhill in feel if not in fact, best in the morning before the sun is high over the open stretch.
Start at the Operaház, neo-Renaissance and finished in 1884, with Liszt and Erkel over the door. Step off the avenue to Liszt Ferenc tér for the café terraces and the Music Academy, then on to the Oktogon, the eight-sided crossing where the ring-road trams cut through. North-east the avenue darkens at the House of Terror at number 60 — a heavy stop, and an honest one.
Past Kodály körönd, the circular junction where the mansions take over, the avenue widens and the shops fall away. It ends at Hősök tere, the colonnade and the Millennium column thrown open at the park gates. The M1 is right there beneath the square.