Riyadh sits in the middle of the country, far from the sea. Summers are very hot - sometimes over 45掳C - and winters are cool and crisp. To survive the heat, modern buildings often have small windows and thick walls, just like the old mud houses used to. The shape changes - the idea stays the same.
The tallest buildings in Riyadh are very famous. The Kingdom Centre has a giant arch-shaped hole at the top, with a glass sky-bridge across it that visitors can walk over. Al Faisaliah Tower has a giant golden ball near its top, with a restaurant inside the ball.
Even though Riyadh is new in many places, it has very old neighbourhoods too. At-Turaif District in the suburb of Diriyah is one of them - a town of beautiful mud-brick buildings that was the original capital, over 250 years ago. It is now a UNESCO World Heritage Site, like Hegra further north.
Children in Riyadh often play outdoors after sunset, when the air cools down. Markets called 'souks' come alive in the evening, selling spices, dates, fabric, lanterns and toys. Many families head to a park or restaurant when the day's heat is finally gone.