Puzzle 15: Building Connections

Visual clue. Four stamps prominently featuring traditional windmills with large sails.

The hook. Windmills have historically been used to mill grain or pump water, becoming iconic historic landmarks in places like Greece and Eastern Europe.

Visual clue. Four stamps whose main subject is a standalone Christian church or cathedral building.

The hook. These religious buildings showcase different architectural styles, from traditional wooden structures in Iceland to grand brick and domed cathedrals.

Here's the trap we set. You might have tried to include 'Prague Castle & Church' or 'Patriarshiy Bridge & Cathedral', but those stamps primarily commemorate a castle and a bridge respectively.

Visual clue. Four stamps primarily depicting fortresses, castles, or grand palace complexes.

The hook. These fortified structures served as royal residences and military strongholds across Europe.

Here's the trap we set. 'Vajdahunyad Castle & Bridge' and 'Prague Castle & Church' might have tempted you into the Bridges or Churches groups, but they are fundamentally castles!

Visual clue. Four stamps whose main subject is a bridge spanning over water.

The hook. These feats of engineering range from arched concrete highways to modern pedestrian walkways over urban rivers.

Here's the trap we set. We set a trap with 'Floating Bridge & Kremlin' and 'Patriarshiy Bridge & Cathedral'. Even though famous background buildings are visible, the bridges themselves are the main subject of these stamps!