There are still a few days of October holiday left, and if you're enjoying a nice staycation like we are (and you've already visited the Museum of Natural History), you might want to check out some of these cool, weird, interesting museums around the city.

The China National Post and Postage Stamp Museum is definitely worth visiting for anyone with an interest in modern Chinese history and/or socialist realist art. The museum is centrally located by the Chang'an Theater, about a five-minute walk from the Jianguomen subway station, and it's free, so there's no excuse not to go.

Highlights include amazing socialist art

A stamp series that shows all 56 Chinese ethnicities singing and dancing in traditional costumes (as they always do)

And a Fidel Castro stamp series

Next up is the Beijing Auto Museum. The mammoth five-story building has been under construction for years and only officially opened to the public on September 23, just in time for Golden Week. It's super popular with families, and lots of interactive driving games make it a dream come true for 9-year-old boys. But we were more interested in the awesome antique cars, including lots of old Soviet and Mao-era vehicles.

Willing to go farther afield? Out in Shijingshan, you can visit Tian Yi's Tomb and the Eunuch Museum. It's a trek, but only RMB8 for admission.

The grounds are very pretty, with lots of flowers, and we ate a picnic there undisturbed.

You can actually go underground into the tombs, which is scary but cool.

Apart from this disturbing statue, the museum has a lot of interesting information, but unfortunately it's only in Chinese, and the dark rooms make it hard to read even for native speakers. Still, if you have the patience, you can read all about the history of imperial eunuchs and how they lived their lives, which is very sad and historically fascinating.

If you're stuck going to (extra-polluted) Daxing for some reason, why not visit the Beijing Watermelon Museum? This place is ree-diculous, not least because of what other things the money to build it could have gone to.

Most of the exhibits look like they Google image searched "watermelon."

But they do have seed samples from just about every watermelon ever.

The super funny thing here is that there must have been an electricity outage at some point, as some of the wax replica watermelons have melted a bit, and are kind of slumped over in the display cases (glass cases meant no good photos, unfortunately). The outdoor sculpture park also has some serious so-weird-we're-laughing-hysterically stuff.

Shout out to AsiaObscura for great tips on several of these places.

Do you know any other weird, wonderful sites around Beijing that we should visit? Let us know in the comments below.