Skyscrapers are the rare invention you can score from the sidewalk. These fifteen questions cover the races, stunts, and near-disasters behind the skyline — cover the answers, commit before each reveal, and keep score on the way up.

Before it meant a building, what did the word “skyscraper” describe?

A triangular sail at the very top of a ship's mast — and, at various points, a tall horse, a tall hat, and a high fly ball in baseball.

What 1854 stunt made tall buildings livable in the first place?

Elisha Otis had the rope of his elevator platform cut in front of a crowd at New York's Crystal Palace exhibition. His safety brake caught, he announced “All safe, gentlemen,” and the top floor stopped being the cheap one.

Which building is generally credited as the world's first skyscraper?

Chicago's Home Insurance Building, finished in 1885 — ten stories on a metal frame. It was demolished in 1931, the same year the Empire State Building opened.

How did the Chrysler Building win the 1929 race to be world's tallest?

With a secret weapon — a roughly 125-foot spire assembled quietly inside the tower, then hoisted through the roof in about 90 minutes to leapfrog its rival at 40 Wall Street.

What barrier did that sneaky spire break?

1,000 feet — the Chrysler Building became the first building ever to pass it.

How long did it take to build the Empire State Building?

About 410 days from first steel to opening day — at its fastest, the frame climbed nearly a story a day.

What was the Empire State Building's mast originally designed for?

Docking airships. Passengers were supposed to step off a dirigible onto a gangway more than 1,200 feet up. Vicious updrafts ended the idea after a few attempts.

What happened at the Empire State Building on a foggy morning in July 1945?

A lost B-25 bomber hit the 79th floor. Elevator operator Betty Lou Oliver survived a 75-story plunge when the cables were severed — still the record for the longest fall survived in an elevator.

What hangs near the top of Taipei 101 to keep it steady?

A steel sphere weighing about 660 metric tons, suspended as a pendulum that swings against the wind. Visitors can walk right up and look at it.

Do skyscrapers really sway in the wind?

Yes — on purpose. Tall towers are designed to flex several feet at the top; a perfectly rigid building would fare far worse.

How can you watch the sunset twice at the Burj Khalifa?

Catch it at ground level, then ride to the observation decks and watch it set again. Clerics even ruled that residents of the highest floors should break their Ramadan fast a couple of minutes later than the ground floor.

What gets hoisted to the top when a skyscraper's final beam goes in?

An evergreen tree, often with a flag — the “topping out” ceremony, a builders' tradition with old Scandinavian roots.

How did Frank Woolworth pay for his 1913 “Cathedral of Commerce”?

Reportedly in cash — about $13.5 million for the Woolworth Building, then the tallest in the world, funded by a fortune built on five-and-dime stores.

How did the Petronas Towers “beat” Chicago's Sears Tower in 1998 despite having a lower roof?

The fine print: spires count toward official height, antennas don't. Sears kept the higher roof and highest occupied floor and lost the title anyway.

What does the Empire State Building have that almost no other building does?

Its own ZIP code — 10118.

Every answer above traces back to one man on a wooden platform telling an assistant to cut the rope. If you scored twelve or more, you're cleared for the observation deck — twice, if you're at the Burj.