ICE SMP is a vanilla+ survival server with a lot of mystery structures and custom biomes, custom villages, custom pyramids etc. Also there is player economy with gold currency

The server has a casino that contains multiple slot machines so go on and try your luck! You can play with your friends, make land claims, create shops, buy & sell items to others with a trading system.
The world border is 10k blocks so there are plenty of unexplored biomes and secret structures to discover!