The highest value stamps in your photos are the US:
4c Columbian (1893) in the second to last row
5c Grant blue (1898) in the row above that, last one on the right
Both these stamps are in below average condition, due to toned areas, missing corner, etc.
They are scarcer than what we see in most
inherited collections.
The rest of the stamps are worth under 4c each.
You can look up relative stamp values on stampworld.com, but you need to know the year.
stampworld.com supplies catalog values for used "#" and unused "*" condition.
Then you need to apply a factor of 15% or so to reach retail price,
and another 50% factor because they are not in good condition.
I see catalog values of $6.59 for the 4c Columbian and $2.20 for the 5c Grant.
Applying a factor of .075 yields $.50 and $.17 .
So no world cruise this time.