Archaeological excavations have uncovered several prehistoric artifacts, including the 12 cm (5 in) Mars von Gutenberg figurine, now on display in the Liechtenstein National Museum.

In the early 12th century, the cemetery was cancelled and fortification of the former church structure slowly began with the addition of a ring wall, forming a simple, roughly circular keep.

This restoration added a number of new structures and buildings to the lower parts of the castle (see ground plan in references section for more details).

After Rheinberger's death in 1936, the municipality rented the castle for various events and guests, until it was offered for sale in 1951, where it was bought by Liechtenstein-born Mexican actress Medea de Novara and her husband Miguel Contreras Torres.

The castle's chapel and rose garden, reconstructed in 2010, are accessible free of charge every Sunday between 10:00 and 19:00 during the summer tourist season (1 May – 31 October).

Guided tours of Gutenberg Castle and its renting for weddings and cultural events are available only during the summer tourist season and need to be arranged in advance by appointment.