The Preslav Archaeological Reserve is located in northeastern Bulgaria and is known for its rich historical significance. It was once the capital of the First Bulgarian Empire during the 9th and 10th centuries. The reserve features the remains of various structures, including churches, fortifications, and residential buildings, showcasing the architectural style of the time. Visitors to the reserve can explore the ruins of the Great Basilica, one of the largest churches from the medieval period, and the Royal Palace. The site also includes a museum that displays artifacts unearthed during excavations, providing insight into the life and culture of the early Bulgarian state.