I got into a strange temple by ramming it repeatedly with a truck.
The one I found was just a pedestal and a metal grate on the ground. I thought about blowing open the grate with C4, but I didn't think destroying a floor tile could work that way and I would just destroy the pedestal and block off access forever. Unless destroying the pedestal grants access somehow (comparable to your classic shooting the control panel), but I thought it would be smarter to just leave it and see if I can find whatever is needed.
Also I must say I don't know how you do so well at the game. Your doing heads and tails better then I have ever been able to do.
I feel like my playstyle is borderline exploitive, but now that I understand it, playing any other way just feels like being intentionally stupid. Once you figure out some simple and efficient ways to grind skills, which isn't hard, it gets stupidly easy. Gather some materials, choose a spot, and just craft/disassemble/re-craft items over and over. Books don't even seem to be that much better much of the time. They help most with skills like electronics that are hard to get started in, because they don't present many crafting options at low levels. Go out and cook some wild animal and bathroom water once or twice a day. You can get any skill up to high levels in just a couple days with focused work. The hardest part is gathering materials, and we've gone over just how easy zombies are to clear out. Most of the difficulty is in inventory management, and the negative encumbrance stuff is a bit too easily exploited. I've got my guy up to almost 180 volume with only 1 torso encumbrance.
Not to mention, archery is still absurdly powerful. I haven't felt any need to touch a real firearm.
This is all assuming you don't get exploded by some high level creature as soon as you step out of the first evac shelter, but if that doesn't happen, the game seems really easy to me now.