Seven Foot Knoll Lighthouse
E398335
Seven Foot Knoll Lighthouse is a historic screw-pile lighthouse, originally built in 1855 at the mouth of the Patapsco River and now preserved as a maritime museum in Baltimore, Maryland.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Seven Foot Knoll Lighthouse canonical | 3 |
How this entity was disambiguated
This entity first appeared as the object of triple T3910373 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Seven Foot Knoll Lighthouse Context triple: [Inner Harbor, majorAttraction, Seven Foot Knoll Lighthouse]
-
A.
Tahkuna Lighthouse
Tahkuna Lighthouse is a historic cast-iron lighthouse located on the northern tip of Hiiumaa Island in Estonia, known for being one of the tallest lighthouses in the country.
-
B.
Elie Lighthouse
Elie Lighthouse is a coastal navigational beacon near the village of Elie in Fife, Scotland, guiding ships along the Firth of Forth.
-
C.
South Stack Lighthouse
South Stack Lighthouse is a historic 19th-century beacon perched on a small islet off the coast of Anglesey in Wales, renowned for guiding ships through the treacherous waters of the Irish Sea.
-
D.
Needles Lighthouse
Needles Lighthouse is a historic offshore lighthouse marking the western tip of the Isle of Wight, England, standing beside the famous chalk stacks known as The Needles.
-
E.
Cape Poge Lighthouse
Cape Poge Lighthouse is a historic coastal beacon on Chappaquiddick Island in Massachusetts, known for guiding ships through the waters off Martha’s Vineyard.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Seven Foot Knoll Lighthouse Target entity description: Seven Foot Knoll Lighthouse is a historic screw-pile lighthouse, originally built in 1855 at the mouth of the Patapsco River and now preserved as a maritime museum in Baltimore, Maryland.
-
A.
Tahkuna Lighthouse
Tahkuna Lighthouse is a historic cast-iron lighthouse located on the northern tip of Hiiumaa Island in Estonia, known for being one of the tallest lighthouses in the country.
-
B.
Elie Lighthouse
Elie Lighthouse is a coastal navigational beacon near the village of Elie in Fife, Scotland, guiding ships along the Firth of Forth.
-
C.
South Stack Lighthouse
South Stack Lighthouse is a historic 19th-century beacon perched on a small islet off the coast of Anglesey in Wales, renowned for guiding ships through the treacherous waters of the Irish Sea.
-
D.
Needles Lighthouse
Needles Lighthouse is a historic offshore lighthouse marking the western tip of the Isle of Wight, England, standing beside the famous chalk stacks known as The Needles.
-
E.
Cape Poge Lighthouse
Cape Poge Lighthouse is a historic coastal beacon on Chappaquiddick Island in Massachusetts, known for guiding ships through the waters off Martha’s Vineyard.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
historic site
ⓘ
lighthouse ⓘ maritime museum ⓘ screw-pile lighthouse ⓘ |
| city | Baltimore ⓘ |
| color | red ⓘ |
| constructionEndYear | 1855 ⓘ |
| constructionStartYear | 1854 ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| county |
Baltimore
ⓘ
surface form:
Baltimore City
|
| currentUse |
museum
ⓘ
tourist attraction ⓘ |
| focalHeight | about 40 feet ⓘ |
| foundationType | screw-pile foundation ⓘ |
| hasExhibit |
displays on Chesapeake Bay lighthouse history
ⓘ
displays on life of lighthouse keepers ⓘ navigational equipment ⓘ |
| hasFeature |
gallery deck
ⓘ
lantern room ⓘ |
| height | about 40 feet ⓘ |
| heritageStatus | listed on the National Register of Historic Places ⓘ |
| historicSignificance |
one of the oldest screw-pile lighthouses in Maryland
ⓘ
served as an aid to navigation for Baltimore Harbor ⓘ |
| laterManagingAgent | United States Coast Guard ⓘ |
| lightCharacteristic | flashing white light ⓘ |
| locatedIn |
Baltimore, Maryland, United States
ⓘ
surface form:
Baltimore, Maryland
United States of America ⓘ
surface form:
United States
|
| locatedOnBodyOfWater | Patapsco River ⓘ |
| material | cast iron ⓘ |
| movedTo |
Inner Harbor
ⓘ
surface form:
Baltimore Inner Harbor
|
| museumType | maritime museum ⓘ |
| name | Seven Foot Knoll Lighthouse self-link ⓘ |
| nearbyCity | Baltimore ⓘ |
| NRHPCategory | maritime property ⓘ |
| NRHPType | building ⓘ |
| openToPublic | yes ⓘ |
| operator |
Historic Ships in Baltimore museum complex
ⓘ
surface form:
Historic Ships in Baltimore
|
| originalLensType |
Fresnel lens
ⓘ
surface form:
fourth-order Fresnel lens
|
| originalLocation | mouth of the Patapsco River ⓘ |
| originalManagingAgent | United States Lighthouse Board ⓘ |
| owner |
Baltimore
ⓘ
surface form:
City of Baltimore
|
| powerSource |
later electricity
ⓘ
originally oil lamp ⓘ |
| purpose | to guide vessels entering the Patapsco River and Baltimore Harbor ⓘ |
| region | Chesapeake Bay ⓘ |
| relocated | 1988 ⓘ |
| shape | cylindrical tower on hexagonal house ⓘ |
| state | Maryland ⓘ |
| tourismRegion | Baltimore Inner Harbor attractions ⓘ |
| yearCompleted | 1855 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Seven Foot Knoll Lighthouse Description of subject: Seven Foot Knoll Lighthouse is a historic screw-pile lighthouse, originally built in 1855 at the mouth of the Patapsco River and now preserved as a maritime museum in Baltimore, Maryland.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Historic Ships in Baltimore