Learn English – What do you call the love of ancient ruins

There is a rare neologism: ruinophilia.

The word ruin is originated from Latin ruina, but usually the part before the suffix -philia ends with "o" in philia words. (Latin suffix -o is usually used to form nominal compounds.)

Some examples:

In contrast to postmodern fascination for multiplicity and simulation, ruinophilia mourns modern single-mindedness and utopian ambition.

_{"Ruins of Modernity" edited by Julia Hell, Andreas Schönle (2010)}

Modern ruinophilia inevitably traced back to the Renaissance and the revival of antiquity, to the baroque, the upheavals of French Revolution, and the nineteenth-century development of archeology.

_{"Writing Postcommunism: Towards a Literature of the East European Ruins" By David Williams (2013)}