“Invisible Serdica” is a free application that gives you the opportunity to explore the hidden and most attractive historical and architectural treasures of Sofia, the capital of Bulgaria, by providing images, videos, 3D models and interesting stories and legends about the locations, different from the standard information you will find in any tourist’s guide. As a start-up several key places were chosen:

1/ “St. Sofia” Church
2/ “St. George” Rotunda Church
3/ The Amphitheatre of Serdica
4/ The Largo (incl. the places around and also hidden beneath)
5/ The tombs hidden below the square of the National Assembly and around it
and others

Most of the content included in the application is taken from old books, which contain unique information, gravures, images and drawings. The idea is to make this interesting but not well-known data available for the wider public and thus make the most inspiring places in Sofia (its former Thracian and Roman name being “Serdica”) even more attractive.

Another, also important aim of the application is to promote NALIS catalogue by providing links to books and other published works (that are related to the places chosen) included into the catalogue.

“Invisible Serdica” application can be useful not only for the users of NALIS’s web site and catalogue and bibliophiles, but also for tourists and visitors of Sofia, as well as for students and teachers and serve educational purposes.

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„Невидимата Сердика“ е безплатно приложение за мобилни телефони, което дава възможност на потребителите да научат повече за скритите и най-впечатляващи исторически и архитектурни обекти в София, столицата на България, посредством изображения, видео материали, 3D модели, интересни истории и легенди за подбраните обекти, различни от стандартната информация в пътеводителите. Като начало бяха подбрани няколко ключови обекта:

1/ Църква „Св. София“
2/ Църква Ротонда „Св. Георги“
3/ Софийски римски амфитеатър