Yes, there are several instances of couples celebrating their marriages in hot air balloons over stunning landscapes, including mountains and seas. Here are some notable examples:

1. Brisbane Hot Air Balloon Wedding: Couples can exchange vows in a hot air balloon, offering a unique experience that provides breathtaking views of the landscape below. More details here.
2. Jackson Hole Elopement: An adventurous elopement in a hot air balloon provides couples with the opportunity to exchange vows against the beautiful backdrop of the Teton Mountains. Read about it here.
3. Lake Tahoe Weddings: Couples can plan their wedding in a hot air balloon while floating above Lake Tahoe, creating an unforgettable experience. Explore options here.
4. Gold Coast Elopement: A sunrise wedding over the Gold Coast was captured as the sun began to rise, highlighting the romantic nature of balloon weddings. View the experience here.
5. Yarra Valley Weddings: Celebrate your love with a sunrise balloon ride over the Yarra Valley, providing stunning aerial views. Find out more here.
6. Breathtaking Elopements: A hot air balloon wedding in the Hunter Valley is highlighted as an unforgettable choice for couples seeking a unique experience. Discover this option here.

These examples illustrate the romantic and adventurous spirit couples bring to their weddings, celebrating their love in the skies.