All those pics are not taken with tripod. If you see these pics, the places are rather well lit, and the point of interest are placed so that they are well exposed.

Like what the rest said, there are many ingredients to taking a good shot at night.
Handling technique, high ISO camera, fast lens, composition, image stabilization

However, for landscape night photography, tripod is a must because every ounce of light is important and low ISO is preferred.