Do you play video games? If so, do you have a favourite game(s)?
Sadly I do not have as much time to play video games as I used to. That being said I do enjoy playing the Civilization series of games, with my favorites of that series being Civilization IV and Civilization VI. I also enjoy doing a bit of retro gaming every now and then as I enjoy the roleplaying games of the 16-bit era, especially Chrono Trigger and Final Fantasy VI.
Didn't even notice this thread existed. Ah well, I'm here now. 
What’s the most interesting building you’ve ever seen or been in?
This is a very good question. Interesting can have many connotations as a building could be one that I despise (like the Faner Building at Southern Illinois University) but still be interesting in its own way (such as how it was designed to not be accessible from one end of the building to another in order to trap potential rioters).

In terms of an interesting building that I enjoyed being in I would have to say it is between the following:
The Cathedral Basilica of Saint Louis:



Now, in fairness, this is the only proper Cathedral that I have been in due to me residing in a very rural area, but it was an awe-inspiring sight. The level of detail in the interior work and the design of the building itself was a wonder to behold. The dichotomy between this building and the degenerate architectural philosophies of modernism and post-modernism was incredibly stark to see first-hand. As architecture like this makes humankind look to the heavens and wonder, whereas the modern way stresses a lack of adornment and a focus on cheapness and disposability.
In terms of the most impressive and interesting modern building I have actually been in that would have to be this:



The Climatron is a building at the Saint Louis Botanical Garden that houses the rainforest display. It is a modern building, yes, but it blends well with the surroundings and does not appear out of place. This is helped by the fact that the dome shape, representing mathematical harmony, fits well with the natural harmony of the gardens around it and residing inside of it. It would certainly be on my "go see" list if one were to go to St. Louis, Missouri.
What is your opinion of the school education system in the United States? Do you think it's very flawed as it is today?
Well, this is a difficult question to answer for a few reasons. First, there is not one education system in the US, but rather fifty separate systems due to the existence of fifty separate states with have broad authority in educational regulation. Secondly, the quality of education can differ greatly from one local community to another due to differences in educational funding (as in the US schools are mainly funded by property taxes - so if you are in a poor area then you get poor educational opportunities).
All that being said I would say that the primary and secondary school education system in the US is flawed in three critical respects: lack of equitable funding between public schools; a lack of discipline in some schools due to concerns over political correctness; and a lack of a student-oriented approach in educational placement.
I think the first aspect is self-explanatory, if poorer neighborhoods are getting less funding due to their property values being lower then, obviously, this will typically lead to an imbalance in the quality of education.
The second aspect is more controversial and, as this is not in After Midnight, I do not want to go to far into it here. But in some school districts there are routine acts of gang violence in the hallways (manifesting as physical assaults and threats) and even assaults on teachers which leads many quality educators to avoid these areas. As outright expulsions are often discouraged as a disciplinary tactic and could result in the administrators being called out for racism or classism, these students are often given detentions or suspensions which does not resolve the underlying issue. As a result discipline breaks down and the students who would want to learn often have their educational quality greatly diminished as a result. My favored solutions to this problem would not be looked upon favorably by some people on this forum so I will not elaborate on them here.
The third aspect is a critical one, I think. The current system in the US tends to operate under the perspective that all students should be at the same level of education in all subjects until about the sixth grade or ninth grade, at which point students might be at different levels in different subjects. This is fundamentally flawed as an educational philosophy. For one, males and females on average mature at different rates when it comes to abstract thinking skills. So keeping all students at the same level (where some males will perform worse until those mental faculties develop) can lead to some of them developing an anti-school mindset early on. This can lead to further disillusionment and educational difficulties moving forward. I experienced this firsthand when I was mainstreamed from special education in third grade. I did well the first year (and probably could have been a grade level ahead in math), but then as the curriculum went progressively more abstract I began to have issues in other subjects leading me to make Cs whereas before I was making As. Then, when I turned 13, my mental faculties for abstract thinking noticeably matured and I went back to making As.
But the third aspect is also an issue in that by keeping everyone at the same level in a subject you are not only holding back those who excel in it, but you are losing those who are not prepared for it. Instead I would propose that for the basic subjects (mathematics, reading, writing, social studies, and science) that in the first eight years of the school system that students are placed in those classes based upon their skill level. There should be a minimum level that they reach in each subject by the end of the eighth grade, but it should be more closely tailored to the student as opposed to a factory-like process that treats students as cogs in a machine. Right now the current system holds back the exceptional, confuses the under-achieving, and makes learning a tedious process as opposed to an exciting process of discovery.