Aside from low gravity, what conditions favor dramatic terrain?

Fantasy and sci-fi works often are set in worlds of dramatic terrain, because, well... it's dramatic. A few examples of the kind of thing I'm talking about:

I understand that Earth has some geographical features which fit the bill, but they're very rare, and not always as wondrous as fantastical depictions. My question is simple. Say I want a world chock-full of spectacular mountains, cliffs, waterfalls, pillars, arches and spikes. How do I justify it?

When I say "justify", I don't mean "say that it's so just because". I want to know what factors and conditions could make my planet more likely to have such dramatic features than Earth. Low gravity is an obvious one, but what else? Note: this world must also be habitable.

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Aside from low gravity, what conditions favor dramatic terrain?

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