Former Flakbunker Wilhelmsburg converted to Energiebunker

Hamburger Flaktürme

Hamburger Flaktürme: Visiting Hours, Tickets, and Historical Significance in Hamburg

Date: 04/07/2025

Introduction

The Hamburger Flaktürme—Hamburg’s flak towers—are imposing World War II relics that have been transformed into symbols of resilience, urban innovation, and cultural regeneration. Originally constructed between 1942 and 1944 as massive anti-aircraft defense structures and civilian shelters, these colossal concrete bunkers protected tens of thousands of residents during the devastating Allied bombing campaigns (en.wikipedia.org; de.wikipedia.org). Today, the towers—most notably Flakturm IV (Feldstraßenbunker or Grüner Bunker) in St. Pauli and Flakturm VI (Energiebunker) in Wilhelmsburg—have evolved into vibrant cultural venues, ecological landmarks, and hubs for renewable energy, while preserving vital historical memory.

This comprehensive guide will introduce the Hamburger Flaktürme’s history, explore their postwar transformation, and provide all the essential information for visitors: opening hours, ticketing, accessibility, travel tips, and nearby attractions. Whether you are a history buff, an architecture lover, or a cultural explorer, the Flaktürme offer a unique perspective on Hamburg’s past and present.

Energiebunker Hamburg 2013 with solar panels and terrace

Introduction
Historical Background
Modern Transformation and Significance
Visitor Information
Practical Visitor Tips
Frequently Asked Questions
Legacy and Reflection
Plan Your Visit
Get Involved and Stay Connected
References

Historical Background

Construction and Wartime Role

In response to the relentless Allied air raids, Nazi Germany undertook the rapid construction of massive flak towers in major cities, including Hamburg, Berlin, and Vienna (en.wikipedia.org). These structures were built to house powerful anti-aircraft artillery and serve as bombproof shelters for civilians. The urgency of their construction led to the use of forced labor, including prisoners of war and concentration camp inmates, often working under harsh and dangerous conditions (Bunker St. Pauli; cnn.com).

Flakturm IV (Feldstraßenbunker, St. Pauli)

Completed in under a year in 1942, Flakturm IV dominates the St. Pauli skyline. Measuring roughly 75 x 75 meters at its base and rising 38 meters high, its walls are up to 3.5 meters thick. The bunker could shelter up to 20,000 civilians during air raids and housed command centers, medical facilities, and critical supplies (de.wikipedia.org; tracesofwar.com). It was also armed with heavy anti-aircraft guns and designed to withstand direct bomb hits.

Flakturm VI (Energiebunker, Wilhelmsburg)

Flakturm VI, completed in 1943 in Wilhelmsburg, was similarly robust, capable of sheltering up to 30,000 people. It featured nine floors, thick reinforced walls, and self-sufficient systems for water and electricity. After partial demolition attempts failed postwar, the remaining structure was adapted for peacetime use (hamburgausflug.de).

Architectural and Strategic Significance

The Hamburger Flaktürme were feats of military engineering, virtually impervious to conventional bombing. Their sheer scale and brutalist design were intended to communicate power and permanence even as ruins (nssmag.com). The towers served not only as anti-aircraft batteries but also as command posts and supply depots, central to Hamburg’s wartime defense.

Postwar Fate and Adaptive Reuse

Demolition of the bunkers proved impractical due to their size and location. Instead, they were gradually integrated into the city’s postwar fabric, providing emergency housing and later accommodating creative industries, music studios, and community spaces (de.wikipedia.org). In the 21st century, both towers underwent groundbreaking redevelopments, blending historical remembrance with ecological and social innovation.

Modern Transformation and Significance

From Fortress to Urban Landmark

The “Green Bunker” (Feldstraßenbunker)

A visionary redevelopment added five new floors and a spiral path to the Feldstraßenbunker, culminating in a lush 1,400-square-meter rooftop garden with panoramic views of Hamburg (New Atlas; Ahoi Hamburg). This “mountain path” is planted with over 23,000 trees and plants, providing an urban oasis and vital green space for the St. Pauli district. The lower levels house the REVERB by Hard Rock hotel, music studios, galleries, and event venues, making the bunker a cultural epicenter (Mirror).

The Energiebunker (Wilhelmsburg)

Wilhelmsburg’s Flakturm VI has been transformed into the “Energiebunker”—a renewable energy center supplying heat and electricity to thousands of local homes through biomass, solar, and photovoltaic systems (hamburgausflug.de; hamburgtourist.info). The rooftop café, Vju, offers sweeping vistas of Hamburg’s industrial and urban landscape.

Memorialization and Historical Responsibility

A dedicated memorial and educational exhibition within the Feldstraßenbunker, developed with Hilldegarden e.V. and the Neuengamme Concentration Camp Memorial, commemorates the forced laborers who built the bunker and the civilians who sheltered there (Bunker St. Pauli). This space encourages reflection on the site’s dark past while celebrating its renewal as a place of community and remembrance.

Urban and Environmental Impact

The towers’ green roofs and facades help cool the city, reduce the urban heat island effect, and foster biodiversity. Their adaptive reuse has set international benchmarks for integrating challenging heritage into contemporary city life (Hamburg.com).

Visitor Information

Opening Hours and Tickets

Feldstraßenbunker (Green Bunker, St. Pauli):

Rooftop garden: Daily, 9:00 AM–9:00 PM. Free entry.
Some exhibitions and events may require tickets—check the official website for current schedules.

Energiebunker (Wilhelmsburg):

Rooftop café Vju: Daily, 11:00 AM–6:00 PM.
Guided tours (energy and history focus): Weekends, book in advance; tickets €10–€15 (hamburgausflug.de).

Accessibility

Both sites are partially accessible. The Feldstraßenbunker features elevators and a spiral ramp to the rooftop garden; some interior areas have stairs and uneven surfaces. The Energiebunker has an elevator to the rooftop café and exhibition spaces. Contact the venues ahead of your visit for specific accessibility support.

Getting There

Feldstraßenbunker:

U-Bahn: U3 to Feldstraße or Sternschanze station.
Bus: Multiple lines serve the area.
Address: Feldstraße 66, St. Pauli.

Energiebunker:

S-Bahn: S3 to Wilhelmsburg station; follow signs from the station.
Bus: Several routes to Wilhelmsburg.

Nearby Attractions

St. Pauli Bunker: Steps from the Reeperbahn, Heiligengeistfeld fairground, and the bustling St. Pauli district.
Energiebunker: Near the Wilhelmsburg district’s modern architecture, parks, and waterfront.

Events and Photo Opportunities

Both towers host exhibitions, concerts, and community events—check their websites for schedules. The rooftop gardens offer stunning photo opportunities with sweeping city views.

Practical Visitor Tips

Dress: Interiors remain cool year-round. Bring a jacket and wear comfortable shoes, especially for rooftop walks.
Photography: Allowed in most areas; check for restrictions during exhibits or events.
Food & Drink: Outside drinks are not permitted, but refreshments are available onsite.
Booking: Reserve guided tours in advance, especially during peak periods or special events.

Frequently Asked Questions

What are the Hamburger Flaktürme visiting hours?

Feldstraßenbunker rooftop: Daily, 9:00 AM–9:00 PM. Energiebunker rooftop café: Daily, 11:00 AM–6:00 PM. Guided tours: Check for weekend availability.

Do I need tickets?

Rooftop gardens are free; special exhibitions and guided tours require tickets.

Are the bunkers accessible for people with disabilities?

Partial accessibility at both sites. Elevators reach rooftop gardens/cafés; some original areas remain challenging.

Can I take guided tours?

Yes, especially at the Energiebunker. Book in advance.

Are special events held at the Flaktürme?

Yes—concerts, exhibitions, and seasonal events are regular highlights.

Legacy and Reflection

The Hamburger Flaktürme stand as enduring reminders of Hamburg’s wartime suffering and resilience. Their history is marked by human hardship, forced labor, and the trauma of war, but also by the city’s determination to confront its past and use these structures as platforms for education, sustainability, and community life (cnn.com). Their transformation into the Green Bunker and Energiebunker demonstrates how challenging heritage can be reimagined as sources of hope, renewal, and cultural vitality.

Plan Your Visit

For the latest information on Hamburger Flaktürme visiting hours, tickets, tours, and events, consult the Bunker St. Pauli official site and Energiebunker Wilhelmsburg. Download the Audiala app for guided historical tours, and follow both venues on social media for current news.

Get Involved and Stay Connected

Support ongoing memorial and urban gardening projects at the Feldstraßenbunker by volunteering with Hilldegarden e.V. (Bunker St. Pauli). Stay updated by subscribing to newsletters and following social channels.