How to make a minecraft dungeon

Make a roofless building

At a small staircase.

Add a roof and a home that way you can get past the staircase

Cover the two holes with a wall and ceiling

Dig a three block deep hole.

Turn the whole into a tunnel

When the tunnel reaches the dungeon had a ladder

Add decor

Go back to the channel and make a staircase out of the whole

Cover the staircase

Add a trapdoor over the hole

Make a barrier with ceiling over hole

Add door

Done!!