Tour poster: The Cartographer's Crucible: Mercator's Duisburg
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Self-guided audio tour

Duisburg

The Cartographer's Crucible Mercator's Duisburg

History & MemoryUrbanism, Infrastructure & Innovation
Distance
1.3 km
Duration
72 min
Route
6 stops

Step into the 16th century and discover how a modest German trading town became the epicenter of global navigation. Join your guide Max and historian Julia as they trace the footsteps of Gerardus Mercator, the man who mapped the world.

Max Krämer
Your guide Max Krämer History & Memory
Audio sample

What awaits you on this Red Thread tour

Step into the 16th century and discover how a modest German trading town became the epicenter of global navigation. Join your guide Max and historian Julia as they trace the footsteps of Gerardus Mercator, the man who mapped the world. From his harrowing escape from the Inquisition to the invention of the projection that still powers your GPS today, this tour contrasts the gritty, cramped reality of Renaissance life with the boundless expanse of Mercator's genius. Unearth hidden archaeological sites, touch the stones of medieval homes, and stand before the original, priceless globes that changed humanity's place in the cosmos.

Your in-app experience

This is how the Red Thread app brings your tour to life.

Red Thread guides you through the city's stories that you won't find in any guidebook. Authentically and compellingly told by our experts and locals.

Home
01

Home

Get inspired and choose a story that fits your location and your mood.

Search for tours directly
02

Search for tours directly

Use the map to find tours in your city or at a specific address.

Redeem in the app
03

Redeem in the app

Redeem purchased tours or City Passes in the app using a voucher code or QR code.

Start well prepared
04

Start well prepared

Explore the route, stops, and many additional features for your experience.

Listen where it happened
05

Listen where it happened

Hear the stories where they happened.

Ask your guide
06

Ask your guide

Get extra context, deeper details, or useful tips nearby.

Collect discoveries
07

Collect discoveries

Build your travel passport and explore fascinating insights.

Itinerary

1

TOUR START

Mercatorbrunnen

A 19th-century fountain honoring Mercator, introducing the paradox of his public legacy versus his private, pacifist reality.

Mercatorbrunnen

Pic by Fred Romero on Wikimedia Commons (CC BY 2.0)

0.06 km • 1 min
2

STOP 2

Salvatorkirche

The late-Gothic church housing Mercator's grave, highlighting his religious ambiguity and physical decline.

Salvatorkirche

Pic by Fred Romero on Wikimedia Commons (CC BY 2.0)

0.07 km • 1 min
3

STOP 3

Alter Markt

The historical center of trade, contextualizing the economic drivers behind Mercator's cartography.

Alter Markt

Pic by Dat doris on Wikimedia Commons (CC BY-SA 4.0)

0.58 km • 9 min
4

STOP 4

Mercator-Quartier (Archaeological Zone)

The archaeological site of Mercator's former house and workshop, where the 1569 projection was invented.

0.20 km • 3 min
5

STOP 5

Dreigiebelhaus

The oldest preserved residential building in Duisburg, offering a tangible glimpse into 16th-century domestic architecture.

Dreigiebelhaus

Pic by Harald Lordick on Wikimedia Commons (CC BY-SA 3.0)

0.35 km • 5 min
6

END

Kultur- und Stadthistorisches Museum

The museum housing the 'Mercator Treasury', featuring his original globes, atlases, and instruments.

Kultur- und Stadthistorisches Museum

Pic by Horst57 on Wikimedia Commons (CC BY 3.0)

Where the tour takes place

Starting point and rough tour area – the exact route unfolds in the app.

Good to know

  • Ideal for History buffs, science enthusiasts, map lovers, and urban explorers fascinated by the Renaissance.
  • Best time Daytime, particularly during museum opening hours (Tuesday to Sunday) to ensure access to the final stop.
  • Museum Entry Check the opening hours for the Kultur- und Stadthistorisches Museum in advance.
  • Footwear Wear comfortable walking shoes for the cobblestone streets around the Alter Markt.
  • Weather Bring an umbrella; the Rhine valley weather can be unpredictable.
  • Pacing Take your time at the archaeological zone to really absorb the layered history.
  • Your voucher You can redeem your voucher for two years from purchase. Once redeemed, you have 14 days of access and can enjoy the tour as often as you like during that time.

Your guide

Max Krämer
Audio sample
0:000:00

Max Krämer

  • History & Memory
  • Northern Germany

Historian with a passion for urban places of remembrance. Has worked in archives and museums for years; shows the traces of revolutions, monuments, and colonial pasts in today's streets.

Frequently asked questions

How do I get to the tour after buying?

You see your voucher code right after payment – and you also receive it at the email address you entered at checkout. Redeem that code in the Red Thread app; that's where the tour starts.

When does my access start?

Only when you redeem the code in the app, not at purchase. From redemption you have 14 days of access to the tour.

Do I need the Red Thread app?

Yes. The free Red Thread app turns your tour into a vivid experience: with audio, a map, and thoughtful prompts, it guides you from place to place in an engaging and entertaining way. It's available free for iOS and Android.

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