| silver |
47 |
| silver applique |
2 |
| silver bracelet |
1 |
| silver coin |
13 |
| silver coins |
61 |
| Silver Constitution |
1 |
| silver mines |
1 |
| silver mining |
2 |
| silver treasure |
2 |
| silver vessels |
3 |
| silver wreath |
1 |
| Silviu Constantin |
1 |
| simargl |
3 |
| Simeon Djankov |
2 |
| Simeon Simeonov |
1 |
| Simeon Zahariev |
1 |
| Simeonovgrad |
2 |
| Simon Bolivar Buckner Jr |
1 |
| Sinagovtsi |
1 |
| Sindel |
2 |
| Sinemorets |
8 |
| Singapore |
1 |
| Singer sewing machine |
1 |
| Singidunum |
2 |
| single beam echosounder |
1 |
| sinking |
2 |
| Sintians |
13 |
| Sintica |
2 |
| Sioniy |
2 |
| Sioux |
1 |
| siren |
1 |
| Sirmium |
2 |
| Sisak |
1 |
| Siscia |
2 |
| sister cities |
2 |
| Sistine Chapel |
1 |
| sitting goddesses from Telish |
3 |
| Siva port |
1 |
| size-biased extinction |
1 |
| Skafida Battle |
3 |
| Skafida Fortress |
1 |
| Skamni Peninsula |
3 |
| Skat River |
3 |
| skeleton |
46 |
| skeletons |
33 |
| Skopje |
3 |
| skull |
8 |
| skull chalice |
1 |
| Skutare |
1 |
| slab |
10 |
| Slatina |
1 |
| Slatina (town) |
1 |
| Slatina nad Bebravou |
1 |
| Slatina Neolithic Archaeological Park |
9 |
| Slatina Neolithic Settlement |
19 |
| Slatina Quarter |
5 |
| slaughter |
1 |
| Slava Vasileva |
1 |
| slave |
1 |
| slavery |
2 |
| Slavka Petrova |
2 |
| Slavnata Kanara (Glorious Rock) Fortress |
8 |
| Slavs |
57 |
| sling |
1 |
| slingshot |
1 |
| Sliven |
22 |
| Sliven Bishop |
3 |
| Sliven Bishopric |
3 |
| Sliven District |
6 |
| Sliven District Court |
1 |
| Sliven District Prosecutor's Office |
1 |
| Sliven factory |
2 |
| Sliven Mayor |
1 |
| Sliven Municipality |
2 |
| Sliven Prosecutor's Office |
2 |
| Sliven Regional Museum of History |
9 |
| Slokolshtitsa |
1 |
| Slovak Academy of Sciences |
1 |
| Slovak Archaeological Institute in Nitra |
1 |
| Slovakia |
6 |
| Slovenia |
3 |
| sluice gate |
1 |
| sluice gate (cataracta) |
1 |
| Small Basilica |
12 |
| Small Basilica Plovdiv |
4 |
| Small Fortress near Voden |
2 |
| Small Palace Pliska |
1 |
| Small Roman Thermae |
1 |
| Small Roman Thermae Varna |
3 |
| small wooden rampart Pliska |
1 |
| smelting |
6 |
| smoking pipe |
1 |
| Smolyan |
7 |
| Smolyan Municipality |
2 |
| Smolyan Regional Museum of History |
5 |
| smuggling |
11 |
| Smyadovo |
1 |
| snails |
1 |
| snake |
7 |
| snake heads |
1 |
