What are some destinations with a tradition of elopement?
Gretna Green is a good example of this - it used to be the go-to destination for elopers in the UK, because laws in Scotland were less strict than those in England and Wales, and it was the first town over the border. It's mentioned in Pride and Prejudice along with other novels. Weddings were often done by blacksmiths rather than priests, and many weddings are still done over an anvil.
An equivalent in the United States is Las Vegas, often performed by an Elvis impersonator.
However, I'm not limiting myself to western countries. I'd be interested not only in specific towns associated with elopements, but also cultures where elopement has some tradition associated with it, so long as they are open to tourists doing such elopements.
In my case, it'd be an opposite-sex elopement, not a same-sex elopement.
Related question: Can you get married while traveling?
Background In case anyone's wondering, I'm not trying to get married without the knowledge of my parents. I'm wanting to know because weddings are getting too big and expensive nowadays.