Tour poster: Regensburg's Invisible Fortress: The Roman Blueprint
Red Thread OriginalRegensburg
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Self-guided audio tour

Regensburg

Regensburg's Invisible Fortress The Roman Blueprint

History & MemoryUrbanism, Infrastructure & Innovation
Distance
1.4 km
Duration
93 min
Route
8 stops

Beneath the Gothic spires and medieval alleys of Regensburg lies a secret geometric ghost: Castra Regina. This tour uncovers the massive Roman military fortress that still dictates the layout of the modern city.

Max Krämer
Your guide Max Krämer History & Memory
Audio sample

What awaits you on this Red Thread tour

Beneath the Gothic spires and medieval alleys of Regensburg lies a secret geometric ghost: Castra Regina. This tour uncovers the massive Roman military fortress that still dictates the layout of the modern city. Join us to trace the walls of the Legio III Italica, hidden in parking garages and basements, and discover how a military machine transformed into a Bavarian cultural capital. We will explore how Roman wine became monastic beer, how a commander's headquarters became a Jewish Quarter, and how the city's very stones tell a story of empire, destruction, and rebirth.

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

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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

Parkhaus Dachauplatz (Parking Garage)

A massive section of the original Roman fortress wall preserved inside a modern parking garage.

Parkhaus Dachauplatz (Parking Garage)

Pic by H.Helmlechner on Wikimedia Commons (CC BY-SA 4.0)

0.13 km • 2 min
2

STOP 2

Historisches Museum (Minoritenkirche)

Home to the 'Founding Stone' of Castra Regina (179 AD), proving the city's military origin.

Historisches Museum (Minoritenkirche)

Pic by Burkhard Mücke on Wikimedia Commons (CC BY-SA 4.0)

0.18 km • 3 min
3

STOP 3

Adolph-Kolping-Straße Wall Fragment

A quiet street where the curvature of the buildings follows the exact line of the Roman wall.

0.28 km • 5 min
4

STOP 4

Porta Praetoria

The northern gate of the camp, facing the Danube and the enemy, showing massive military engineering.

Porta Praetoria

Pic by Nikater on Wikimedia Commons (Public domain)

0.21 km • 3 min
5

STOP 5

Document Niedermünster

An excavation site under the church showing layers from Roman HQ to Duke's residence.

Document Niedermünster

Pic by Steffen Schmitz on Wikimedia Commons (CC BY-SA 4.0)

0.47 km • 8 min
6

STOP 6

Goliathhaus

A medieval patrician house in the northern sector with a mural linking to Roman 'giants'.

Goliathhaus

Pic by Dguendel on Wikimedia Commons (CC BY 3.0)

0.35 km • 6 min
7

STOP 7

Neupfarrplatz (Principia)

The former Roman Headquarters, then Jewish Quarter, now a square. The pavement marks the history.

Neupfarrplatz (Principia)

Pic by User:Mattes on Wikimedia Commons (Public domain)

0.28 km • 5 min
8

END

Römerturm at Kornmarkt

A medieval tower built on Roman foundations, connecting defense needs across centuries.

Römerturm at Kornmarkt

Pic by Aisano on Wikimedia Commons (CC0)

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, urban explorers, archaeology enthusiasts, and anyone who loves uncovering hidden layers in a city.
  • Best time Daytime, ideally between 10 AM and 4 PM to ensure access to the museums and excavations.
  • Access Note The parking garage and excavations are usually open, but check opening times for Document Niedermünster.
  • Footwear Cobblestones are everywhere. Wear sturdy, comfortable walking shoes.
  • Photography Flash photography is often restricted in the underground excavations.
  • 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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