Fort Ebersberg, Artillery fort and military museum in Berg am Irchel, Switzerland

Fort Ebersberg, also known as Fort Rüdlingen (army designation A5438), is a fortress built into a north-facing sandstone slope above the Rhine near Berg am Irchel. Its two separate blockhouses each held a semi-automatic 75 mm gun; the guns were removed in 1978. The underground complex includes a 30-metre ventilation shaft, two diesel generators, a two-storey troop quarters with 66 beds, and a command post. Surface installations have interpretive displays.

The fortress was constructed between 1938 and 1940 as part of Switzerland's Border Line defenses against potential German invasion during World War II. It represents the country's military preparation during this uncertain period.

This fortification reflected Swiss concerns about border security and shows how the country prepared for potential threats during a tense period. The site demonstrates the engineering choices made to protect strategic locations.

The surface areas are accessible for walking, though the underground sections are typically closed to the public but can be visited through organized guided tours. It is best to check with local historical organizations beforehand for tour availability and access conditions.

Designated as A5438, this was the only fortification of its type in the entire canton of Zurich, marking a rare remnant of reinforced border defense. This distinction makes it a singular example of Swiss defensive architecture from that era.