Bees will store vast amounts of honey--enough that humans can take large amounts and still leave the bees with enough to make it through the winter.  Bees also build hives that last for many generation of bees.

Of course it's also true that bees don't "think" about putting honey aside for the future.  Bees just do what bees do.

Yes, massive civil structures that take almost a generation to build.

The Swiss voted in 1998 to do a twenty year, 31 billion Swiss franc (= to $1 trillion for US) upgrade of their rail system.  The keystone of the entire project will take 17 years to complete (from memory).

Miami wants to build a 103 mile elevated "subway" over 25 years.  90% of the population will be within 3 miles of a station, over half within 2 miles.  They are taking themselves a 1/2 ¢ sales tax to pay for it.

Large dams, etc.