Fort of São Lourenço do Bugio

The Fort of São Lourenço do Bugio, also known as the fort of São Lourenço da Cabeça Seca (Saint Lawrence of the dry head) or simply Torre do Bugio (Bugio Tower), is located in the middle of the estuary of the river Tagus, near Lisbon in Portugal. With no further need for its military functions, it is presently a lighthouse. The fort's location is on a sandbank formed by the silting of the river mouth, the result of the meeting of the river's waters with those of the Atlantic Ocean. Being the only sandbar of the Tagus river with its surface above the tide throughout the year, it was given the name “dry head”. The derivation of the name “Bugio” (monkey) is uncertain but may be related to the French word for candle, “bougie”, due to the similarity of the fort's structure with a candle on a candlestick.

Building data from Wikidata (CC0); heights normalised. Summary from Wikipedia (CC BY-SA).