Mexico City attractions: which ones actually sell out in advance?

Going to CDMX for a week in June and trying to figure out what I need to book ahead vs what I can wing. On the list: Museo Nacional de Antropología, Frida Kahlo (Casa Azul), Chapultepec Castle, maybe Templo Mayor.

I know Frida sells out weeks ahead (already booked, phew). But do the others actually sell out, or can you just rock up? I don’t want to waste a morning booking timed entries for something that has a 10 person line at the door. Any intel appreciated.

Mexico City is high on my list too, so I’m following this thread closely :sweat_smile: Especially curious about Frida Kahlo and Chapultepec Castle tips.