Tasked with designing a venue to rival the opulent opera houses of Paris and Milan, Hungarian architect Miklós Ybl filled it with frescoes depicting Greek gods alongside a 3,000-tonne chandelier, thick marble pillars and vast expanses of gold. Located on UNESCO-listed Andrássy Avenue, the ornate exterior features statues of Hungary’s two most famous composers: Ferenc Erkel, who composed the country's national anthem, and Franz Liszt. If you can bag a place on the guided tours, don’t miss the chance to peek inside the royal box, where sculptures represent the four main operatic voices: soprano, tenor, alto and bass.