International and domestic wellness tourism accounted for $563 billion in 2015, according to the Global Wellness Institute, and is expected to account for as much as $808 billion by 2020. TripAdvisor recently dug into the data to determine the top 10 U.S. cities for travelers looking to improve their spiritual or physical health.

Sedona is best known for its photogenic red rock formations and plentiful hiking opportunities. However, the desert oasis is also ideal for relaxation and reflection. Learn about Sedona's healing vortexes and spiritual properties on a one-on-one or small group soul tour.

This charming borough sits on the Lackawaxen River in northeastern Pennsylvania and is a great place to decompress outdoors as its home to a handful of lakes, including Lake Wallenpaupack, the third-largest man-made lake in the state.

Head northwest of Los Angeles to discover the charming city of Ojai. Nestled in a scenic valley in the Topatopa Mountains, visitors will uncover peaceful village vibes and likely feel brand new after exploring its picturesque hills and orchards.

Amelia Island can be found just northeast of Jacksonville near the Florida-Georgia border. The underrated seaside destination is home to some of the country's most relaxing beaches and top luxury resorts. Visitors can also recharge physically with healthy made-from-scratch meals from Burlingame Restaurant in Fernandina Beach.

Located in Napa Valley, Calistoga has everything you need to feel completely relaxed, including natural hot springs, mud baths and wineries. Begin your calming experience at MoonAcre Spa and Baths, one of the nation's most luxurious.

This western Massachusetts small town is ideal for a harmonious New England getaway. Visitors can rejuvenate their mind, body and soul at the Cranwell Spa and Golf Resort without breaking the bank with nightly rates under $180.

If sunshine makes you happy, Palm Springs is guaranteed to put you in a better mood. The desert destination receives more than 350 days of sunshine per year and is home to countless pools that will help inspire your digital detox. Palm Springs is also great for those looking to avoid summer crowds.

Park City is renowned for its world-class skiing and spas. It's also home to dozens of healthy restaurants and the scenic Union Pacific Rail Trail, which is perfect for a relaxing stroll.

Vermont's most charming mountain town oozes tranquility no matter the season and the four-star Stoweflake Mountain Resort and Spa in downtown Stowe will serve as a cozy base camp throughout your wellness retreat.

Visitors to Wailea can do their yoga and meditation above the ocean on a paddleboard, snorkel their stress away on one of Maui's best beaches-Keawakapu-and unwind at the blissful Four Seasons Resort Maui at Wailea.