Botzlar castle, the rudiment of a former water castle, is to be preserved and secured in its fragmentary character. The floor-to-archaeological findings, and the rising parts are again set in relation to each other. The main house of the former ensemble is made to be the structural solitaire and is made historically and spatially readable as the coarse rough diamond it actually is. The “historic quarries“ at the main house remain widely visible, the castle building will not be blocked by a new multi-story building. the spatial development potential of the castle is met in the existing building and interiorly extended. The ensemble of castle and its surrounding park with its historic remains, will be centered and made readable by the new concept of the three “castle rings“. All exterior and interior areas are designed completely barrier-free. The ring path in the castle park is easily accessible for people with a disability. The historic main entrance remains, only the cobbled pavement is complemented by a smoother, barrier-free pavement. The garden ramp strengthens the original position of the former castle garden and leads visitors directly into the foyer. Inside the house, there is a lift which reaches every floor. The castle building is preserved in its substance and carefully enhanced. Special emphasis is placed on the preservation of historic components. New designs are made visible only where no original findings exist. By fitting the barrier-free entry in the castle garden and installing a self-supporting elevator shaft into the hollow body of the window reveal, the requirements of the monument, accessibility and spatial gain is taken into account. The existing stair case is preserved, only one flight of stairs will be relocated. The ground floor is defined by four flexible, multifunctional spaces. The two seminar rooms, coupled to one another, receive a prominent location on the ground floor. The Foyer with its new meeting place greets the visitor with its white plastered fireplace. It’s flanked by glass doors and constitutes the interface to the gallery with its temporary exhibitions. Many original features such as the wooden ceiling, the stone floor and the flight of stairs are preserved.