Is it appropriate (as a Catholic) to make the sign of the cross when passing an Eastern Orthodox, Oriental Orthodox or Church of the East church? It is an old tradition in Catholicism to make the sign of the cross when passing a Catholic church, as a sign of respect to the Eucharist contained in the tabernacle, located within the Church.

I am wondering:


Do Eastern Orthodox, Oriental Orthodox, and Church of the East also have tabernacles in their churches?
If they do, is it appropriate for a Catholic to make the sign of the cross when passing these churches?
Is it appropriate for a Catholic to make the sign of the cross when passing an Eastern Orthodox, Oriental Orthodox or Church of the East church?

Of course it is!

It is also a tradition for some Catholics to make the sign of the cross when passing in front of cemeteries, whether a Catholic one or otherwise. Of course there would be some of the faithful departed in many of these cemeteries I imagine. 

Seeing that the Orthodox Church does have valid sacraments which includes the  Eucharist, it would be appropriate for a Catholic to make the sign of the cross when passing in front of a Orthodox church in order to show an external sign of respect of the real presence of Jesus Christ in the consecrated host. 

Yes, the Orthodox Churches do have tabernacles in their churches (No. 8) as this image from Wikipedia shows: