die Ruine
ruin
The remains of a destroyed, collapsed, or dilapidated structure, such as a castle, palace, or house.
Wir besichtigten die alte Burgruine auf dem Hügel.
We visited the old castle ruin on the hill.

ruin
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ruin
The remains of a destroyed, collapsed, or dilapidated structure, such as a castle, palace, or house.
Wir besichtigten die alte Burgruine auf dem Hügel.
We visited the old castle ruin on the hill.

'Die Ruine' (the ruin) belongs to the word family of the verb 'ruinieren' (to ruin). When something is 'ruiniert' (ruined), it is destroyed or turned into a 'Ruine' (ruin).
Der Skandal hat seinen Ruf vollständig ruiniert.
The scandal completely ruined his reputation.
You can recognize the meaning of 'Ruine' (ruin) from the context. Compound words like 'Burgruine' (castle ruin) or 'Klosterruine' (monastery ruin) refer to buildings. Adjectives like 'menschlich' (human) or 'finanziell' (financial) point to the figurative meaning for a person or a company.
Die Schlossruine ist ein beliebtes Ausflugsziel.
The palace ruin is a popular destination for day trips.
In connection with buildings, 'Ruine' (ruin) is often used with verbs like 'besichtigen' (to visit/tour) or 'besuchen' (to visit). A common phrase is also 'in Ruinen liegen' (to lie in ruins), which means that something is completely destroyed.
Im Urlaub haben wir eine alte römische Ruine besichtigt.
On vacation, we visited an old Roman ruin.
Describing a person as a 'Ruine' (wreck) is a strong metaphor. It is used to express that someone has been completely worn down physically or emotionally by illness, misfortune, or emotional stress.
Die lange Krankheit hatte ihn in eine menschliche Ruine verwandelt.
The long illness had turned him into a human wreck.
collapse / breakdown
'Zusammenbruch' and 'Ruine' can both have to do with severe destruction or complete failure. The most important difference is: 'Zusammenbruch' usually describes the moment or process in which something suddenly stops functioning, collapses, or a person can no longer cope. 'Ruine' describes more the state afterward: something is destroyed, dilapidated, or completely finished. With buildings, a ruin is what remains after destruction. Figuratively, a project or a person can also be described as a 'Ruine', but that sounds very strong. In short: the 'Zusammenbruch' is the event; the 'Ruine' is the result or the state.

Auf dem Hügel steht die Ruine einer Burg aus dem Mittelalter.
On the hill stands the ruin of a castle from the Middle Ages.
Nach dem Zusammenbruch der alten Brücke wurde die Straße sofort gesperrt.
After the collapse of the old bridge, the road was closed immediately.