On Hamburg Street in Segeberg, Heinrich Rantzau had two structures built in honor of Danish King Frederick II: a pyramid and an obelisk. Both are inspired by ancient models and were unique in their form in northern Germany at the time.

The walls of the pyramid were made of plaster from the Segeberg chalk hill – a building material that is not weather-resistant. As a result, the pyramid gradually fell into disrepair and was replaced by a chapel at the end of the 18th century, designed to resemble the original structure. This building has been preserved to this day. Inside, there is an octagonal stone altar that still dates back to the pyramid, as well as a commemorative plaque featuring a portrait of Heinrich Rantzau and an inscription about the building’s history.