AN airport in the UK has a secret viewing platform for plane fans wanting the best spot.
And people are shocked that they've never heard of it.
Travel influencer Sima revealed how to find the secret spot on her Instagram account.
She explained that the secret spot is at London Heathrow Airport, in Terminal 4.
Sima said in the : "Flying from Heathrow Terminal 4 soon? Did you know about this?
"If you head to gates 15 and 16 you will find View Heathrow.
Read more on UK airports
"Head up the steps for a 270-degree observation deck with panoramic views of the southern runway."
She then showed the amazing views of planes taking off and landing on the tarmac.
However, she did issue a word of advice for anyone heading there.
Sima continued: "My only warning? It's a bit like a greenhouse in there and can get quite hot.
Most read in News Travel
"Nevertheless - happy plane spotting!"
Her followers were left stunned by the sneaky airport find.
One Instagram user wrote: "How have we missed this?"
Another commented: "Never knew about this!"
A third said: "That's so cool! Will definitely be doing that next time I'm in that terminal."
The viewing platform actually opened back in 2014, with the deck being an unused airport lounge.
There are even fixed iPads on the platform to show live flight radars as well as binoculars to get a better view.
Kathryn Leahy, Terminal 4 Director previously said: "We are proud to be opening this viewing facility for passengers.
"We know that many travellers enjoy plane spotting and we are pleased to be able to provide them with the opportunity to do so once again."
Don't worry if you aren't flying from Terminal 4 - Heathrow has revealed where to get the best views from each terminal.
In Terminal 2, head to the Wondertree restaurant for runway views, although the best Terminal 3 views are at the No.1 Traveller Lounge which you have to pay for.
READ MORE SUN STORIES
And if you're flying from Terminal 5, head to either Gordon Ramsay Plane Food and Wagamama to get runway views.
Here's a clever airport hack that lets you avoid the crowds.