Sydney Tower

Sydney tower is currently the 37th tallest building in the world at 309 meters tall. The view from the tower is quite something; you can see in all directions with all of Sydney below you. You can see the ocean from the tower as well as Hyde Park, the Harbour bridge and many other landmarks in Sydney.

You can also take the skywalk, which is walking on a glass floor viewing platform with the streets of Sydney directly below your feet. To put the height in perspective the skywalk is twice the height of the Sydney Harbour Bridge, so if you don't like heights that may not be for you, but it is quite a unique experience. You can see the glass floored skywalk below.

There is also a restaurant that is one floor of the tower aptly named the revolving restaurant as the floor moves slowly around to give views from every angle. The restaurant serves lunch from 11:30 to 2 and dinner which can be between 5 and 9pm. The food served includes seafood, modern Australian, Italian, Chinese, Japanese and Thai cuisine.

Sources
http://www.redballoon.com.au/media/products/au/321x214/STB220_01.jpg
http://d391ajziizh6xg.cloudfront.net/media/products/au/321x214/BRD181_02.jpg
http://farm3.staticflickr.com/2484/5799408043_5327581111_b.jpg
http://i.cdn.travel.cnn.com/sites/default/files/styles/article_large/public/2011/06/15/sydtowermain.web_.jpg?itok=ZsOWDmoJ