Open House, which in some places is Doors Open, is a wonderful event. The concept is simple: at designated places around town, you can go in and look around during specified hours on a particular weekend for no charge. I’ve been attending Chicago’s most years since 2013.

More American cities ought to do it. Worldwide, almost 60 cities do so under the Open House banner, with only four U.S. cities participating: Chicago, Miami, New York, and San Diego. Others are Doors Open: Baltimore, Buffalo, Milwaukee, Minneapolis, Pittsburgh, and the state of Rhode Island, which is only a little larger than a metropolitan area. Note the many missing from both lists, such as Atlanta, Boston, Dallas, Denver, Los Angeles, Nashville, Philadelphia, San Francisco, Seattle – and I could add more among large and mid-sized cities.

We were thinking of visiting New York this year for its event, which was a week ago, but ultimately decided on the Bruce Peninsula for our October trip. Maybe next year. As it happened, Chicago was the same weekend as New York, October 19 and 20, and since we were back from Canada by then, we went ahead with another Chicago Open House.

We focused on downtown this year, mostly because I didn’t feel like driving to any other neighborhood, and Metra takes you right to Union Station. Steps away – as real estate listings tend to put it – is the Sears Tower (I’m not calling it anything else). The blue wavy feature is fairly new.

The ground level of the tower has been redeveloped since the last time I was there, adding a large food hall. Do-Rite Donuts & Chicken looked really tempting, but no. Some other time.

The open part of the Sears Tower for Open House Chicago was the Metropolitan Club, up on the 67th floor. I’d been there before a couple of times, for business lunches in the early 2000s.

Nice views, but no one was giving away views from the Skydeck up on the 103th floor. Tickets to that are timed, and sell for $32 or more, a fact that irritates me. I remember visiting in 1987 for $3.50, which is the equivalent of a little less than $10 now. Sure, there’s now a glass box jutting out that stands between you and eternity when admire the vista from that perch. Add a few dollars for that, but that isn’t enough to justify the gouge.

Never mind, we also visited the Chicago Board of Trade Building and the Wintrust Bank Building, both near the intersection of Jackson and LaSalle, as we made our way eastward. Both are marvels of design and familiar — but you can always see something new. After lunch we spent a good long time at the Fine Arts Building on Michigan Ave. Also familiar, but so many details to engage your attention, if you let it. All 10 floors were open, and we rode the manually operated elevator up to the 10th floor and made our way down the stairs.

That was it. Fewer places than in most years because, it seems, word of Open House Chicago has finally gotten around, and each place we visited had a line to get in. So did Symphony Center, which we didn’t want to wait for. If I remember right in 2013, that wasn’t the case, when everyone I mentioned the event to had never heard of it, and you could walk right in each sight.