Hagia Sophia in Istanbul has served as a major religious building for different traditions. Which combination best describes its historical uses?

The Colosseum in Rome was primarily built for what purpose during the Roman Empire?

The Sydney Opera House is especially recognizable because its roof is made up of a series of structures resembling what?

The Taj Mahal in Agra, India, was commissioned by which Mughal emperor as a mausoleum for his wife Mumtaz Mahal?

Fallingwater, one of Frank Lloyd Wright's most famous houses, was designed to be built in an unusual relationship with what natural feature?

The Burj Khalifa in Dubai is famous for its record-breaking height. Approximately how tall is it?

The Sagrada Família in Barcelona is famous for its extraordinary architecture. Who designed the basilica and made it his most famous unfinished work?

Buckingham Palace is best known today as the London residence and administrative headquarters of which institution?