[1] The current lighthouse was built in 1903, designed by a leading architect of the time, Gustaf Nyström.

[2][1] The octagonal tower is constructed of iron over a granite base, and attached to it is the lighthouse keeper's accommodation made of timber.

[1] Kallo is highly unusual among Finland's lighthouses, in that it can be reached by car, and it is therefore a popular destination for visitors.

[1][3][4] The Mäntyluoto area, comprising mostly late 19th and early 20th-century buildings, includes in addition to the lighthouse and related facilities also the Pori pilot station, coast guard station, cafeteria, and the oldest yacht club in Finland, Segelföreningen i Björneborg.

[5] The milieu has been designated and protected by the Finnish Heritage Agency as a nationally important built cultural environment (Valtakunnallisesti merkittävä rakennettu kulttuuriympäristö).