Be wary of gladiators outside the colosseum. They don't take photos for free and can be quite agressive about their payment. Also don't be fooled into taking an unlicensed guided tour of the Colosseum either....

MJ Article on Colosseum

A tip for people looking for a decent coffee shop.. if you don't already know about it, you will because most Contiki travellers find out about it - its The Grasshopper. Ask a local and they should be able to tell you where to find it.

efti Article on Amsterdam

...hikes along the provided paths through basins of hot springs and geysers are an amazing experience...

ankopsu Article on Yellowstone National Park