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World 3 · Flying Buttresses · 14 min · PRO

The Gothic challenge

Tall, light, full of windows

PRO · Arches, Domes & Towers

World 3: Flying Buttresses is part of PRO

The first world of Arches, Domes & Towers is free. PRO opens the other 20 lessons in 5 worlds — simulations, quizzes and all.

  • Flying buttresses
  • Pinnacles and weight
  • When it goes wrong
  • Cables under load
  • Suspension bridge anatomy
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Arches, Domes & TowersTry the free world
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