9 hidden gems across the US you should visit at least once

Casey, Illinois hosts the world's largest mailbox, standing at 5,743.41 cubic feet. It's fully functional, featuring a built-in stairway for visitors to mail their own letters.

Casey, Illinois:

Solvang, California, just two hours from Los Angeles, resembles a Danish village with its mermaid statues and Spanish-style architecture. It's close to Santa Barbara wine country, perfect for combining cultural exploration with wine tasting.

Solvang, California:

White Sands National Park in New Mexico boasts the world's largest gypsum dune field, covering 275 square miles with wave-like white gypsum dunes.

Tularosa Basin, New Mexico:

Mitchell, South Dakota, draws visitors to its unique Corn Palace, made entirely from corn and corn husks since 1892. It hosts an annual festival celebrating the state's main crop.

Mitchell, South Dakota:

Seaside, Florida, known for its pastel-colored buildings and quaint charm, served as the filming location for "The Truman Show". It's a picturesque beach town near Panama City Beach.

Seaside, Florida:

Ruby Falls in Lookout Mountain, Tennessee, features America's tallest underground waterfall. Visitors can descend 260 feet by elevator to explore ancient cave formations and scenic cavern trails.

Ruby Falls, Tennessee:

Bishop Castle in central Colorado is a remarkable structure built by Jim Bishop, featuring stained glass windows, bridges, and even a fire-breathing dragon, all amidst the San Isabel National Forest.

Rye, Colorado:

Fly Geyser in Nevada, accidentally created in 1964, erupts with vibrant colors due to mineral deposits. While on private land, tours are available on weekends to see this natural marvel.

Northern Nevada:

Assateague Island, straddling Maryland and Virginia, is famous for its wild horse population. It's also a sanctuary for dolphins, peregrine falcons, and numerous bird species.

Assateague Island: