THEN & NOW: Stunning photos show how much city skylines have changed over decades

Derek Flack/Blogto.com; Luke Abrahams/iStock

Toronto's skyline in the 1930s compared to today's.

You can tell a lot about a city by looking at its skyline.

Over the decades, many cities have exploded in size and have introduced ambitious works of architecture to the world.

Two decades ago, Dubai was a relatively undeveloped city. Now it's filled with gleaming skyscrapers. And cities like Toronto look virtually unrecognizable compared to a century ago.

Here are 13 cities whose skylines look completely different, several decades later.

The permission to use some of these photos were obtained through RENTCafé.