The church , considered the oldest building in Sofia, is charming, both outside and inside. I visited it twice as I have a weak spot for round structures ,and this one is particularly attractive and interesting. Photography of the interior is forbidden; there's a tiny souvenir shop inside selling photos of the beautiful icons and frescoes seen on the church's walls /dome, and some religious artifacts.
This little church definitely has it all: architecture( low and simple, in contrast to the communist style tall buildings surrounding it),religion (orthodox,still in use as a place of worship), history(dates back to the 4th century), archeology (it stands amid ruins of the ancient Roman town Serdica).
Roman ruins in the church's garden
the Rotunda restaurant
When inside or outside it, one feels a kind of serenity/peacefulness overcoming him/her, and senses the presence of Divinity all over the place. A 'must see' in Sofia.
peacefulness