The answers to the clues below will have something in common.

1. Hidden obstacle to promotion
2. Metaphor for Communism in the 1950's
3. Nile River man-made wonder
4. Exclusive home developments often
5. Metaphor for the Cold War
6. Australian natural wonder
7. They make good neighbors, poetically

Answers:

1. Glass ceiling
2. Iron Curtain
3. Aswan High Dam
4. Gated communities
5. Berlin Wall
6. Great Barrier Reef
7. Good fences