Which happened earlier: Eiffel Tower completed or Empire State Building opens?

Question 1

Which happened earlier?

A Eiffel Tower completed ✓ Earlier

B Empire State Building opens

Eiffel Tower completed (31 March 1889) came before Empire State Building opens (1 May 1931)

Question 2

Which happened earlier?

A CN Tower opens

B Willis Tower completed ✓ Earlier

Willis Tower completed (3 May 1973) came before CN Tower opens (26 June 1976)

Question 3

Which happened earlier?

A Burj Khalifa opens

B Taipei 101 opens ✓ Earlier

Taipei 101 opens (31 December 2004) came before Burj Khalifa opens (4 January 2010)

Earlier #140