I was a church, then a mosque, and now a museum in Istanbul, Turkey. I was built in 537, at the time I was the biggest structure in the world.

I am 21,196.18 km long, and over 2,300 years old. I was built to protect China from enemy attacks in the north. I am the longest structure in the world.

I am the largest mosque in the world. All Muslims face me when they pray. Millions of people visit me a year.

I am a huge man made stone circle in England. I am a prehistoric structure that took over a 1000 years to build. Until today no one knows how I was built, legends say I was built by giants.

I'm a french royal palace outside Paris. I have over 700 rooms, 1200 fire places, & 60 stair cases. My gardens are over 30,000 acres, have 400 sculptures & 1400 fountains.

I am the largest religious building in the world, a temple in Cambodia. My name means 'City of Temples'. I was built to preserve the my king's ashes.

I'm an abandoned stone city built by the Incas in Peru. My name means 'old mountain'. I'm built on a mountain ridge, 2430m above sea level.u

I was build by the Pharaohs of Ancient Egypt. I am a tomb for king Khufu. It took 20,000 workers 20 years to build me.

I'm a bell tower in Italy. I stood up straight for 5 years before I started to lean over to one side. I have 7 bells representing the 7 notes of the musical scale.

I am the tallest building in the world. I am a 160 stories high. I live in Dubai and I cost US $1.5 billion to build.

I'm the largest work of art in the world. Carved out of the Black Hills of South Dakota, USA. The mountain was named after a New York attorney, Charles E. Rushmore. I took 14 years and almost 400 people to carve out the images of 4 US presidents on the hill.

I am the biggest museum in the world, located in Paris, France. I am home to over 380,000 works of art and history, including Leonardo Da Vinci's 'Mona Lisa'. I get around 17,000 visitors a day!

I am the home of the British Monarch in London, England. I have 775 rooms, and 78 bathrooms. I have 2 secret tunnels that run below the surface that connect to nearby streets

I am a mausoleum in Agra, North India. Built as a tomb for Mumtaz Mahal, the 3rd wife of emperor Shah Jahan. My name means 'crown of palaces'. It took 20 years to build me.

My home is Liberty Island in the New York Harbor, USA. I am made of iron and copper. I am 305 feet tall and I weigh 225 ton. I was built in France and moved in pieces to the USA. I represent freedom.

I am a Roman amphitheater in Italy. The largest amphitheater in the world. I was built in 81AD, and used for gladiator contests, executions and mock battles.

I live on the harbour of Sydney, Australia. I was built in 1973. People come from all over to watch art performances on my stage.

I am a 445 year old church in Moscow, Russia. I am made up of 9 churches connected to each other. My official name is 'Most Holy Theotokos on the Moat', but I'm more commonly known as...

I am a temple in the middle of the Acropolis in Athens, Greece. I am over 2,460 years old. I have been used as a temple, a church, and a mosque at different periods throughout history.