OP I know it's tough and teens are challenging at times but it is really worth remembering that your teens have an utterly different normality & experience of the world than you & your dh, thanks to your joint hard work to ensure that.
They cannot really understand what your childhoods were like because it's beyond their grasp both due to their age & lived experience.
They presumably mix in circles where their peers fly off to various locations on a regular basis & they see this as entirely normal in their world. And wonder why they're not doing likewise.
I think it's a huge pity that you can't overcome your fear / phobia/PTSD as you have had the pleasure travelling brings (you say you travelled the world from 19?) And your dc are interested in having these experiences
But even more than that I think it's a huge pity that you don't enjoy holidays with your family & find them stressful. My mother was like this & honestly speaking even though we went abroad on highly organised package holidays every few years & we all got on with it her behaviour ruined all holidays.
She huffed & puffed & was impatient & cranky & super panicky about everything. It was infectious & holidays were never ever fun. AND we HAD to be grateful for it.
I can remember sitting by the pool as as 13 / 14 year old & watching all these families relaxed & laughing & having what seemed like so much fun & our family was nothing like that. My mother lack of enthusiasm & fear held us all back. Every single holiday she made herself ill with stress & we'd spend hours listening to her ailments or unable to go from the resort as she had to be near a toilet or we'd traipse around looking for pharmacies...
I swore I would never be like that once I was old enough to travel on my own & I'm not
I've travelled the world including China on my own etc & since having dc have travelled extensively with then since they were tiny
We now have teens & relish having breaks away with them as it's a time to really reconnect & chat & explore & have time together. We do shorter breaks of 3-5 days now as they also like to get back to their pals & it means we do more of them than 1 longer holiday.
We have an almost 17 year old & we're really conscious that our days of family trips are relatively numbered so we're making the most of it
I LOVE when they say stuff like oh let's go to Paris or new york next....not because we can always afford to do what they suggest but because it shows how they feel it's all possible for them & that they enjoy doing it with us. In those instances we have long chats about why they'd like to visit xxx or yyy & what we'd do there etc
And lots of times we don't go to the place they suggested but somewhere else entirely.
Someone up the thread suggested the op bring her teens to Ann Frank House or Berlin as a punishment to show them how people suffered in the war. As though this would not be a holiday but educational & that did surprise me as all of our trips have an element of seeing/ experiencing something cultural - museum or galleries & we've brought dc to both of these places as part of city breaks in those cities!!