T-Rex in Ulaanbaatar
If you haven't seen a T-Rex fossil, then head to the Central Museum of Mongolian Dinosaurs in the centre of Ulaanbaatar. It has recently been renovated and isn't big but it does have a T-Rex fossil on show. This fossil was smuggled out of Mongolia and was recently returned after a complex legal battle (all the details provided in the museum).
Image from Flickr: courtesy of Anna Faherty