The tunnels of Cu Chi hide an entire world including classrooms, kitchens and medical facilities underground. Today you can see the tunnels from above and even try to go down one, so as to better understand the hardships that Vietnamese soldiers had been through during wartime. One is left utterly amazed by the determination and endurance of those who dug through solid soil, gravel and sand to construct this 200-kilometer (125 miles) long underground network.

Even though Georgians are not the biggest fans of their Soviet heritage, this great example of Tbilisi 70s brutalism must not be missed. Built on steep slopes in Nutsubidze street, it is one of the quirkiest constructions you will ever see. The three apartment blocks are connected by a bridge that goes through them. From the sky bridge, you can also see a nice view of the residential parts of Tbilisi. Once you are up and walk through the bridge, turn right and take a walk down the winding streets and admire a Caucasian architectural know-how: semi-legal additions to residential blocks of all shapes, sizes and materials.

The National Museum of Ukrainian Architecture and Culture is Europe's biggest open air museum. Here you will get an insight in Ukraine's culture, history and all of its historical ethnographic regions in a fun and interactive way.