One that is considered similar to a defensive stronghold: You are a bastion of strength. See Synonyms at bulwark.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "bastion" in a sentence
"He has decried what he characterized as a bastion of lobbyists for seeking special carve outs to limit the effect of proposed financial regulation."
"And, since this kind of writers are the main bastion of Portuguese SF/F production, it seems wrong to me to just dismiss them."
"Venevision, once a particularly notorious anti-Chavista bastion, is now known as the Disney Channel, for its increasing abundance of cartoons and bland newscasts."