I also advise looking up the hashtags #expeditionunknown and #destinationtruth on Twitter to connect with other fans, as well as the two Facebook groups for this fan site network HERE and HERE (same content is shared on pretty much each page right now, but I am looking to change that up for 2017).
Here is the "Expedition Unknown" airing schedule on Travel Channel: on Wednesday the 28th, from 4 p.m. EST until 9 p.m. EST, there is a marthon followed by a brand new episode - it's Part 1 of the Wooly Mammoth case, which is awesome! There are then more reruns that night until 4 a.m. There is also a rerun on Saturday, which is a good way to celebrate before the New Year!
As always - the schedule on the Travel Channel site is sometimes not accurate, so be sure to check local listings. You can also check out occasional "Destination Truth" reruns on Syfy and Chiller TV. Also, if you do not have Travel Channel, you can buy episodes on iTunes.