Size It Up

ALL ANSWERS · LANDMARKS · DAILY No. 18 · SEPTEMBER 21, 2026

Size It Up Landmarks answer: September 21

The five Landmarks silhouettes for September 21, with the true sizes. If you have not played yet, this page is a spoiler — play these five first, then come back to argue with the numbers.

Day 18 ran from the Belém Tower (30 m) to the Burj Khalifa (828 m). The widest gap was round 2, Gateway Arch against Burj Khalifa, at 4.3×; the closest call was round 5, Brooklyn Bridge against Shanghai Tower, only 1.3× apart — the kind of round that separates a 90 from a 60.

  1. ROUND 1

    Tokyo Skytree vs Palace of Culture and Science (including antenna support)

    Palace of Culture and Science · reference · 237 m
    Tokyo Skytree · true height · 634 m

    2.7× taller than the Palace of Culture and Science

    Tokyo Skytree stands 634 m tall, the tallest tower in the world.

  2. ROUND 2

    Gateway Arch vs Burj Khalifa

    Burj Khalifa · reference · 828 m
    Gateway Arch · true height · 192 m

    4.3× shorter than the Burj Khalifa

    St. Louis's Gateway Arch is 192 m tall and exactly as wide as it is tall.

  3. ROUND 3

    Taipei 101 (architectural height) vs Eiffel Tower (to the tip)

    Eiffel Tower · reference · 330 m
    Taipei 101 · true height · 508 m

    1.5× taller than the Eiffel Tower

    Taipei 101: 508 m height (architectural height). Measured from the base to the architectural tip; includes the permanent spire, where present.

  4. ROUND 4

    Belém Tower (four-storey tower) vs Florence Cathedral (to the top of the lantern)

    Florence Cathedral · reference · 116 m
    Belém Tower · true height · 30 m

    3.9× shorter than the Florence Cathedral

    Belém Tower: 30 m height (four-storey tower). Base to top of the four-storey tower; the lower riverside bastion is omitted.

  5. ROUND 5

    Brooklyn Bridge (main span only) vs Shanghai Tower (architectural height)

    Shanghai Tower · reference · 632 m
    Brooklyn Bridge · true length · 486.3 m

    1.3× shorter than the Shanghai Tower

    Brooklyn Bridge: 486.3084 m length (main span only). Main span between the two towers: 1,595.5 feet, converted exactly to metres. Approaches are excluded.

Beat these tomorrow

Every round is worth up to 100 points: within 6% of the true size scores 100, half or double scores 45, five times off scores zero. The daily puzzle is the same five for everyone and refreshes at midnight in your time zone; if you want more than five, Size It Up Unlimited draws fresh pairs from the whole library for as long as you like.

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MixedAnimals, planets and everyday things. AnimalsLength, height or wingspan — every round names the axis. GeographyEast–west or north–south span, never area. Pop CultureCheck the version. Compare the measured dimension. VehiclesLength end to end, or height for the ones that stand upright. DinosaursCompare estimated body length, from snout to tail tip. SpaceCompare body diameter. Rings and orbital distances are excluded. Everyday ObjectsLength, height or width — every round names the axis. InsectsBody length or wingspan — read the named measurement. LandmarksRead the named height, length or main span — including its endpoints. Food & DrinkRead the selected size and axis — length, diameter or container height.
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