Last Updated: 8th Aug 2012
For a great view of the city (especially at night) go to the top of the Eiffel Tower at Paris. It also offers a great vantage point for viewing the water show at the Bellagio.
A hike to the top of Yosemite Falls is among the best the park has to offer.
Definitely worth doing if you are in any way interested in Ancient Rome - the guide is a wealth of knowledge.