Cardiff skyscraper would be one of UK's tallest buildings

The super-sized tower would be the tallest building in the UK outside London.

Plans for a gigantic skyscraper have been announced in Wales, and it could be one of the tallest buildings in the UK.

The 50-storey tower is planned to be 180 metres tall - almost twice the height of Big Ben!

If it's built, it would be the third tallest building in the UK, and the tallest building in Wales.

It will be in Cardiff city centre, and would tower over the Principality Stadium next door.

What are the tallest buildings in the UK?

The Shard is the tallest building in the UK, but it's still nearly three times smaller than the Burj Khalifa in Dubai.

The tallest building in the UK is The Shard in London.

At 310 metres, it's bigger than 20 double-decker buses stacked on top of each other!

But it's not as tall as The Burj Khalifa, in Dubai, which is currently the tallest building in the world.

It can be seen from over 60 miles way and is a sky-high 800 metres tall - almost as tall as three whole Eiffel Towers!

The tallest building in the UK outside of London is the Deansgate Square South Tower, in Manchester.

What is the tallest building in Scotland?

The Glasgow Tower is the tallest freestanding structure in Scotland.

The tallest freestanding structure in Scotland is the Glasgow Tower.

It stands at 127 metres tall, and it can even rotate 360 degrees.

In fact, it holds the Guinness World Record for being the tallest fully rotating freestanding structure in the world.

According to some experts though, the structure isn't technically considered a building, as it doesn't have continuous floors.

There aren't any skyscrapers in Scotland, but there is one currently under construction.

Destined for skies in 2028, The Ard in Glasgow in will be a whopping 114 metres tall, with 36 floors.

What is the tallest building in Northern Ireland?

The Obel building is located in Belfast, the capital of Northern Ireland.

Across the Irish Sea, the tallest building in Northern Ireland is the Obel Tower.

Although it's not a skyscraper, it's not too far off.

With 28 floors and reaching 85 metres into the sky, it's comfortably the tallest building in the country.