A short distance from the temple of Hephaestus in Thission, the church of Saints Asomatoi is a simple, cross-in-square church with a narthex and Athenian-style dome, supported by four columns. Dating from the mid-11th century, the church sits approximately two metres lower than the current street level.

During the 19th and 20th centuries, the church underwent extensive renovations, which left only the original Athenian dome unaltered. However, around 1960, the church was fully restored to its original form, revealing its Byzantine masonry. Some late-Byzantine frescoes were also discovered at this time along with a valuable silver case containing sacred relics. To date, the contents of the case have not been identified.