What on Earth... Masonry Materials is one of the most sought after resources of the ancient era, after wonder enhancing limestone and marble and strategics like copper, iron and bronze... It literally makes your units go 50% faster
I am seriously asking the author to do SOMETHING about the AI putting its units on Explore (Automated) order until the end of the game. First of all, the units do nothing useful - they don't take part in warfare, they don't defend cities, they don't counterattack, etc. Second of all, there's nothing to explore so the units end up doing circles somewhere between the AI's core cities, so it's completely pointless. Third of all, if it's a quick unit like a Light Cavalry, and the AI has railroads, and your "show enemy moves" option is on, and you have recently flown an airplane over your rival's territory or just have ships near his 5 tile island, you're in the world of pain. In the absence of any place to actually explore (no unexplored tiles or no way to get to those) units are stuck in a continuous loop of moving one tile at a time until they run out of moves, so you'll be looking at all these moves for a long time.
I've had a submarine blockading my rival recently and it just so happened that another nearby rebel civ located on a TWO tile island DOW'd me and every single turn I've had to watch a bunch of his irregulars walk into the woodland tile and back into the city, into the woods and back into the city, into the woods and - you get the point.
Also, honestly, I don't want to see worker moves either. When you're raiding the enemy coast in hopes of finding free exp and are forced to look how his 20 workers are building stuff - it gets old fast.