Museum of Fusion Power

As a small family stepped from the autonomous air transport, popularly called a wasp due to the characteristic drone of it's shrouded thrusters, the smallest child spoke up.
Daddy, What is this place, there aren't any buildings and it's so bright my eyes hurt.
Be calm Tosi, we are outside at the moment, just outside that building over there, see. That's the Museum of Fusion Power, and we will be back inside soon. Cities used to be like this place, with individual buildings and large spaces "outside" where the sun shines bright and there is no protection from the environment. People used to have to travel between buildings every day to go between residences, workplaces, and shops. That was before the discovery of practical and portable fusion power, which is what this museum is about, and here we'll learn how fusion power became common and how our cities changed from difficult and dirty places like this to the clean and efficient megacities like our own home in Monrovia.
The other adult in the group spoke up
Come, children, let's hurry along and we'll be in the museum quickly.
The family hurried forward into the large entryway, and quickly joined a tour group that started with the Pleiades Corporation exhibit, continued through the many demonstration reactor exhibits, and ended with the history of the inventor and those who contributed most to the later refinements of this most foundational element of human civilization.

The Museum of Fusion Power. Established in 2076, the three hundredth anniversary of some old-world nation's "birth". The nations were gone now, replaced by the all-encompassing Pleiades Corporation. The museum was housed in what used to be the largest office building in the world, and the home of that nation's military bureaucracy. The large structure was mostly built with heavy concrete, remained in the middle of a wide open area with clear sky above, and retained both excellent access to the "Metro" underground mass transit system and the newer surface and airborne transit options. The structure proved perfect as a museum to the now dominant form of energy for humanity, controlled fusion power in the form of inertial electrostatic confinement with modified t-wave induction heating. The extensive underground areas provided vast areas for offices and workshops and surprisingly large volumes for demonstration units. The placement on filled-in swampland adjacent to a river also provided easy access to water to cool and supply the many small fusion power units used in the demonstration exhibits. The above-ground areas, with their many anachronistic external windows, offered spectacular natural-light galleries to exhibit interpretive displays and histories of both the technology and its creator. Of course, no such history could be complete without a thorough exploration of the role fusion power played in the creation and growth of The Pleiades Corporation, which funded the entire museum, and an entire wing of the five-segmented structure was dedicated to this purpose. The museum quickly became one of the most popular attractions of Earth, and remained so until its spectacular destruction in the first wave of tragic events at the beginning of the Great Grieving in 2128.