Explanation:

Konark Sun Temple is a 13th century temple of Odisha, built by Narasimhadeva I of the Eastern Ganga Dynasty.
So, the temple was used as a navigational point by European sailors. They referred to it as the 'Black Pagoda' due to its dark colour and its magnetic power that drew ships into the shore and caused shipwrecks.
The monument was also called the Black Pagoda (Kaala Pagoda) by the European sailors. In contrast, the Jagannath Temple in Puri was called the White Pagoda. Both temples served as important landmarks for the sailors. Konark Sun Temple used Iron beams for its structure.