The remains of the fortress can be visited
Preslav Fortress (Преслав)

In Veliki Preslav, Bulgaria, the Fortress of Preslav, once the heart of the First Bulgarian Empire, stands today as a ruin site. This historic complex was not only a strategically important military base but also a cradle of Old Church Slavonic written culture.
History+
The origins of settlement in Preslav date back to Thracian tribes in the 13th to 14th centuries BC, before a Slavic settlement developed here. After the founding of the First Bulgarian Empire around 678 through the unification of Slavic tribes with the Proto-Bulgarians, Preslav gained importance as a military stronghold. Under rulers Khan Krum and Omurtag, the fortress was expanded to secure the Varbitsa Pass. In 893, Tsar Simeon I the Great moved the imperial capital from Pliska to Preslav, after which the city experienced a golden age. It became a center of written culture and Orthodox faith, with the construction of a patriarchal palace in 927. It is believed that the Cyrillic alphabet originated here around the mid-10th century. After being plundered by Sviatoslav I around 970 and subsequently destroyed by the Byzantines in 972, Preslav lost its capital function. In the Second Bulgarian Empire, the site again served as a military camp until the last inhabitants left the fortress in the 13th century and founded a new town. The final destruction occurred in 1388 by the Ottomans.
Location+
The Fortress of Preslav is located in Veliki Preslav, in the Shumen district, Bulgaria, at an elevation of approximately 137 m above sea level.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Preslav_fortress_11.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 43.1453, 26.8127