The Blockhaus is located in the inner fortress ring
Restaurant
Fortress Ingolstadt-Blockhaus

A historic fortification, the Ingolstadt Blockhouse was part of the Ingolstadt State Fortress. It is within the city's inner fortress ring. Today, it houses a restaurant and is an accessible part of the city's historical heritage.
History+
The Ingolstadt State Fortress underwent several expansion phases. After the fortress was destroyed by Napoleonic troops in 1801, reconstruction as a neoclassical complex began in 1828 under King Ludwig I. Despite other recommendations, he chose Ingolstadt as the site for the new royal Bavarian main state fortress. In the course of these construction works and subsequent extensions, the first outer fort belt was also planned.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 48.7602, 11.4186