You could, hypothetically, travel over to surprise them... But in the likely chance that you can't afford to do so, here are some truly spectacular gifts that say "I miss you" and "Your life is so damn cool."
Carry On Cocktail Kit
ModCloth
I Was Here: A Travel Journal
Anthropology
Try The World Holiday Box
Try The World
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Personalized Wanderlust Embossed Leather Passport Cover
Etsy
Cities 2016 Calendar
Anthropology
"Talk Is Chic" Correspondence Cards
Kate Spade
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Power Card Ultra Thin Charger
Anthropology
Important Sh*t Duffel Bag
Nasty Gal
World Map Watch
Etsy
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Travel Phone Case
Etsy
Interactive Travel Journal
Urban Outfitters
Jennifer Hill Throw Blanket
Wayfair
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Compass Pillow Cover
Pottery Barn
Flight 001 "TSA Pop" Gift Set
Nordstrom
Framed World Travel Vintage Advertisements
Wayfair
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City Shimmer Cosmetic Bag
Anthropology
Adventurers Coffee Mug
Etsy
Ted Baker Luggage Tag & Passport Holder
Ted Baker
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Hide and Seek Coffee Table Book
Urban Outfitters
Adventure Journal
Gent Supply
World Tea Tasting Set
Bed Bath
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