It was established according to article 5 of the second protocol to the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict, which provides for the establishment of national registers of cultural property.
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The Speicher (Warehouse) and Tierli house are listed as Swiss heritage site of national significance.
The oil press and sawmill at Schlossweg 2 and the castle chapel are listed as Swiss heritage sites of national significance.
Its Biedermeier village around the church square is listed as a heritage site of national significance.
The Koblenz Aar railway bridge (which is shared with Koblenz) and the ruined Roman watchtower over the Rhine at Im Sand-Felsenau are listed as Swiss heritage sites of national significance.
The Schmittentobel and Landwasser Viaducts of the Rhaetian Railway are listed as Swiss heritage sites of national significance.
The Säckingerbrücke (wooden bridge) at Schaffhauserstrasse is listed as a Swiss heritage site of national significance.
The Appenzeller Volkskunde-Museum, Eisensteg Zweibruggen (shared with St Gallen), Gmündertobel Bridge (with Teufen), Urnäschbrücke im Kubel (bridge shared with Herisau) and the Wattbach Bridge (shared with Teufen and St Gallen) are listed as heritage sites of national significance.
The farm house Aeckenmatt at Aeckenmatt 6, the ruins of Grasburg castle, the Frühmesskapelle at Käppeligässli 5, the Rossgrabenbrücke (bridge, shared with Rüeggisberg), Schwarzenburg Castle and the granary at Henzischwand 298 A are all listed as Swiss heritage sites of national significance.
The Baronenhaus at Marktgasse 73, the Dominican Abbey of St. Katharina, the Hof (the former seat of the Prince-abbot) and the pilgrimage church Maria-Hilf at Dreibrunnen are listed as Swiss heritage sites of national significance.