Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.

VOA: special.2009.08.23

Later a transport system was added to permit people to visit an observation area inside the top of the arch.

VOA: special.2009.03.04

Earlier this year, Tehran's arch-enemy Israel test fired its own Arrow 2 missile in a simulation of stopping the Shahab-3.

VOA: standard.2009.09.28

The arch has a cable car that takes visitors to the top for breathtaking views of the city and the ocean.

VOA: standard.2010.02.10

But in his conciliatory mood Saturday, Mr.Ravalomanana suggested he would not object to a constitutional change that would allow his arch-rival to seek the presidency.

VOA: standard.2009.11.08