Spires are extremely common in old world buildings and always include a conductive ornament of some kind on top.

Apparently, there used to be an object in these but they were removed. However, some old photographs show these objects still in at the time. Looks like it has to do with harnessing or storing atmospheric energy.

The fact that these are almost always present on old buildings implies it is for functionality rather than aesthetics.

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Coral Castle is an oolite limestone structure created by the Latvian-American eccentric Edward Leedskalnin (1887–1951). It is located in unincorporated territory of Miami-Dade County, Florida, between the cities of Homestead and Leisure City. The structure comprises numerous megalithic stones, mostly limestone formed from coral, each weighing several tons. It is currently a privately operated tourist attraction. Coral Castle is noted for legends surrounding its creation that claim it was built single-handedly by Leedskalnin using reverse magnetism or supernatural abilities to move and carve numerous stones, each weighing many tons.

In the tool room of Coral Castle, you can see something strange: there are several bottles wound with wires. Why did Edward Leedskalnin wrap wires around these glass bottles? Was Ed going crazy? Well, these bottles were a part of Ed's experiment with magneticity