Towers

For impressing foreign players, you can build archery towers to shot them secretly, a tower is near 40 blocks long.

For What Can You Use Towers?
Archery Towers: archery towers are near 35 blocks. For a good archery tower you must have a chest with 128 arrows (2 stacks of arrows) and 10 bows (10 stacks of bows) if you have a mod that brings crossbows to Minecraft, it`ll be better. Archery towers are built with wooden planks. Better with oak Wooden planks.

Wizard Towers: wizard Towers are towers basically with exactly 40 blocks long. They`re built with cobblestone. You must have a room with enchantment tables, Brewing stands and a balcony with a Nether portal. They are protected by mossy cobblestone walls or a wolves family.

Castle Towers: this type of towers are basically rooms for princes or princess. They are used too for protecting the castles