What material is still considered the 'par excellence' choice for lighthouse construction in exposed, sea-swept locations? đ§±
Difficulty: Easy
What material was used to construct the Leasowe lighthouse on the Wirral shore due to the lack of a suitable foundation? đą
Difficulty: Medium
What type of material is characterized by blocks that are dovetailed together not only laterally but also perpendicularly, creating a solid mass when completed? đ§±
Difficulty: Hard
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